I respect your opinion but, let's be brutally honest here: Does anyone actually remember the draconic pantheon except for Tiamat, Bahamut, and maybe Sardior?
Frankly I thought the draconic pantheon were TSR being TSR and gap filling with sloppy worldbuilding. They are not missed, they were not impressive pieces of worldbuilding, and the fact they're replaced with normal dragons with barely any change speaks to that. Just slapping "oh they're the god of draconic X" doesn't make an exciting pantheon. Mind, TSR couldn't build a pantheon their way out of a wet paper bag