The rooms can sleep 4 adults but I don't think Disney wants 4 "adults" in one room, they'd rather you book two rooms. I think it's listed that way to allow for the "Disney Adults" ... aka 10+ years old.
The dressers have the equivalent of 5 drawers, it's just two don't slide out. Doesn't make it any less storage than 5 drawers.
The dressers are going the route of many hotels, especially with modern or boutique theme, less dressers/drawers, more cubbies and locker style closets. Glad you never had a broken drawer. I have stayed a lot and have, as well as at moderates. Doors break too but at least there is no mechanics of the sliders that get bent and therefore not shutting. I think from Disney's perspective there is more than enough storage for a family of four for the average stay. Will it make everyone happy?, no, but they are going to design for the masses, for economics and space.
Most guests who find they need more space, storage and furniture than a value move to a bigger room resort or move offsite. Disney wants you to always be looking for a better option and hope that it is a more expensive room of theirs. If you move offsite ... they don't care, they will fill the room no matter.
I get the room doesn't make you happy. When I have had hotels I like change their options to my dismay ... I move on.