Silvercat Moonpaw
Adventurer
And it may be possible now in the argument to see why some people may not like this idea so much: Sure, they may be concerned purely with balance, but they may also be hitting a different version of "this does not fulfill my expectations of fantasy". If their version of fantasy says that magic users can't turn into dragons and/or it's not an immediate win the fact that those things are true in D&D throws them off. Same with the issue of fighters being able to compete with magic users. They cry foul and demand a change to fulfill their desires as they have been taught by other people doing the same.But Wizards and magic users of all kinds have the ability to turn into dragons in books and movies. They should have it in D&D. And turning into a DRAGON should pretty much be an immediate win.
What's really the problem is that they are looking at D&D as if it's supposed to do all different kinds of fantasy. Which it's not, not at default (I'm acknowledging it can be tweaked). D&D does (as far as I can tell) high-hero, magic owns, abstract combat, and a blend of cinematic and realistic simulation rules. Expect one of those aspects to be different and you may end up assuming the game hasn't been done right. D&D is only at fault in this for not being clearer up front what kind of fantasy it is, it's not at fault for not fulfilling a kind of fantasy image for which it has not be designed.