Provide evidence or your conclusions aren't helpful. In fact several people reported your post and pointed out if you had done the math to check, you'd find out that your conclusions are actually wrong.
Originally Posted by Ionel
The greatest advantage I see with the T11 four set bonus is that it is a controllable proc. If used with Core of Ripeness - Item - World of Warcraft in conjunction with Mana Tide Totem (and possibly another trinket spirit proc) it is possible to net a very large amount of mana back during the course of a fight.
Using my own stats of 4027 int and 2151 spirit self buffed:
Normal combat regen - 2312
Non-MTT w/ T11 4set - 4052
Non-MTT w/ set and Core of Ripeness - 6124
Regen with mana tide - 8093
MTT w/ T11 bonus - 14188
MTT w/ T11 and Core of Ripness - 21434
MTT lasts 12s, 4set lasts 10s, and CoR lasts 20s.
As you can see, stacking spirit procs under the effects of Mana Tide Totem will net ~50k mana. On a side note, MTT is on a shorter cooldown than it was last expansion, meaning we can have a MTT up 2 times (per shaman) in a 5 minute fight.
im fairly certain MTT only takes in consideration Basespirit + spirit from items, not buffs or trinket procs.