Why dont druid weapons add DPS in the same amount as for classes that use the weapon damage? Easy... druids get much more from base stats.
This chart assumes that druid has heart of the wild and survival of the fittest. I'm actually not sure whether these stack additively or multiplicatively for strength, so I assumed additive... the least beneficial to the druid. For other classes, I assumed all talents that increased stat effectiveness were taken (without needing more than 61 talent points, no imp zerker stance + vitality), and I even counted blessing of kings for pallies as a self-buff, even though it can obviously be cast on druids.
Druid Rogue Warrior Paladin
AP/Str: 2.46 1 2.2 2.42
AP/Agi: 1.03 1 0 0
Crit/Agi: 0.0412 0.025 0.0303 0.044
Percent Improvement in Druid Scaling:
Rogue Warrior Paladin
AP/Str: 146% 11.8% 1%
AP/Agi: 3% infinite infinite
Crit/Agi: 64.8% 36% -6.4%
Those numbers dwarf your concerns over 14%.
Indeed, druids do not get quite the same benefit from feral dps stats as weapon-using classes get from base dps. But, the weapon using classes dont get nearly the same benefit that druids get for base stats. And though you can make a (mildly faulty) case that paladins get similar scaling, if you complain about being outdpsed by a paladin of any spec, you should be forced to reroll or at least never spec feral again.
If I were to come in here and claim that warriors should get 1 AP per agi, and only need 25 agi per 1% crit, it would be quickly identified as pure crap... and warriors
still wouldnt be getting the same scaling druids do. Complaining that druids dont get enough contribution from weapons is the same flavor of whine.