>>36652458600 BST almost isn't enough now. Mons need something to inflate or pseudo inflate their stats even more to reach Ubers or OU. TTar gets boosted SpD. Lati@s, Mence, and Metagross get megas. Tapus get terrains that boost their attacks while supporting the team. Greninja gets a midbattle mega or STAB on everything. UBs get an auto stat boost for KOs.
Dragon is also no longer amazing offensively. Between Steel and Fairy being the god types, Dragon is no longer the good neutral coverage. Fug runs Flying as the main STAB. Mega Altaria runs Fairy. Ground, Fairy, Dark, and Flying are the main spammable STABs now. Dragon has some niches defensively, but Goodra doesn't get recovery.