Blizzard talked about that they want to give bosses avoidance in later tiers so that they scale with gear.

With that said, it depends on how they implement it. If they only increase dodge and parry, then interrupt won't be an issue since mobs nor players can dodge/parry while casting. If they also allow bosses to be missed more often, then this will be a concern.

Just a note re: missing interrupts. While casting, your target cannot dodge, parry, or block - so only the hit cap itself needs to be considered, not any expertise caps. I think as other posters have said, this really ought to be a dps responsibility. All melee now have a 10 second cd interrupt, though it is true that kitties and some DKs will not be hit capped either.

I really don't understand why hit is being so neglected... While I admit I have not started upgrading to raid gear seeing I can't get members online to run my raids (mass recruit inc) but I've not found it hard to hit cap while still having good mitigation. and I really can't understand why any tank would want to neglect the hit cap. Sure taunts don't miss now but instead we have an interrupt that can and who wants their interrupt to miss? There are 2 reasons I will always aspire to be as close to the hit cap as possible.

1. I know for a fact that the spell is being interrupted, even if you have a dps to interrupt you still may need a clutch skull bash.

2. It frees up more dps, who doesn't want a boss to die faster?

I know that threat is currently not an issue but threat was never the only reason to be hit capped.

Being able to survive is much more important. You should focus on tanking first, and build a hit-capped set on the side for the (should be) rare occasion that you need to be relied upon to interrupt.

I can see where you are coming from but I frequently find myself doing it anyway and I actually consider it to be increasing my chances of survival, but I guess not everyone looks at it in the same light.

edit: afterall I can't dodge a fireball but a can definitely interrupt it if I have too

On content that matters though, why wouldn't you put hit capped DPSers on interrupting whilst you focus on survivability? Sure whilst Skull Bash couldn't miss we were great for interrupts, especially in 10 man where interrupts can be limited in certain composistions, but now it can there are far better options than making your tank cap hit for interrupts.

Yeah I see where you are coming from, I guess I'm still a little bit in the old mindset.

Well that is frankly a silly idea. If you really have to interrupt, keep some off pieces with hit on or just use two trinkets with it on. Building it into your base set when on the majority of fights it is providing you with zero use is just wasting stat points that would be better served elsewhere.

Also it sounds like a composition issue that you're gimping yourself to overcome. Do you run with no melee? On all those fights you only really need two melee interrupters to handle it, and on Council only one. For Nefarian you'll need 3 but having your tanks double up on one add is fine. If you really have to be the only one on Felidius the tank damage on Council is pretty low anyway, just throw on your hit trinkets and you'll be fine.

Is silly better? Yes I do believe points not spent in survivability are wasted. Threat is a joke right now and other than the first few seconds of a fight no DPS will ever catch you unless you're doing something horribly wrong.

Even if we believe that you have 0-1 melee DPS in your raids as interrupters it still doesn't change the fact that you would only need to be hit capped on 4/12 encounters yet you're letting a near useless stat when not interrupting be on your gear in the other 7 encounters. Don't get me wrong, I have 3 pieces I can swap to be hit capped should the need arise, I just don't see the reason to have it on your standard gear. This issue will only be exasperated further if you intend to go onto Heroics where every point of survivability is going to matter. I'm sorry that you got offended that you weren't immediately praised as the paragon of Druid 10 man raiding but your whole premise to begin with is based around a bad composition 10 man where you're forcing your tank to forego survivability stats in favour of hit. Whilst it might be necessary in extreme situations I don't think anyone should be suggesting it as the normal for 10 man gearing.

There is no higher importance on hit in 10's or in 25's. In both, the interrupter assigned should be hit capped. The question was with the point that you're assigning one or both of your tanks as the primary interrupter and forcing their survivability down in exchange for hit.

This is the really important part that needs emphasizing. If you're serious enough about playing a feral druid to come to EJ in the first place, you should be serious enough to carry a few extra pieces of gear around that you can swap in for interrupt-heavy fights. That applies to cat as much as bear (even if this is the bear thread). Heck, any remotely competent druid carries multiple gearsets anyway and has some mod or other for switching back and forth. So it really is a no-brainer.

Carry high hit items. Only wear them as needed.

About kitty gear, I found myself tanking Chimaeron far better than our official bear yesterday and I was wondering about the power of mastery and absorb in this specific fight.
My gear is full Agi/Mastery cause I'm primarily kitty spec'd and every healer of the raid confirmed I was taking far less damages on double-hit attacks and was very easy to keep alive.
Any thought about mastery in this encounter for a bear ? Or maybe it's only depending on dodge and agi ?

It almost certainly means something is wrong with how you're configuring it. If you open an issue and attach your character, we can tell you more, but things to check first are buffs (fully buffed, correct consumables), talents (just to be sure), options (target damage and survival softcap). Also make sure that there are actually mitigation enchants/gems/gear available for it to use.