If it would really be only few misses I would say I agree with you, but the amount of misses without melds is ridiculous.
If they would give healers something to do in the snooze fest dungeons that miss rate would be fine, but the thing is tanks cannot pull more to make us work more and there isn't enough for healers to heal atm. So that leads to healers sitting there idle thumbs up in their ass.
The acc cap being high kicks especially whms cuz whms don't have any skill that could not miss and really nothing else to do if nobody needs healing. Asts have their cards and dots that cannot miss so they have atleast something to do and schs have dots that cannot miss either so I guess thats somthing.
Melding acc to gear would be silly since in harder content whms and asts are usually the main healers so there the healing suffers for it. Melding shouldn't be required before hard content, hard content is the place where u need to choose if you choose main or off healing which also affects your meldings.