Megas, in their current state and with the benefit of hindsight were a mistake. There's a world where they were actually properly utilized in boss fights and didn't get cut leading to several Pokemon that really did need them forever being crimped out of key buffs at the mercy of whenever the creators decide to bring them back. That world is not this one. Even if it was, they wouldn't have the immediacy and dependability of cross-gen evos, nor the worldbuilding contributions of regional forms. More Ursalunas and Wyrdeers, less Mega Garchomps por favor.
Wait a minute, I love Mega Evolution
With Legends Z-A on the way I thought I'd make a new tier list and wow actually most of these guys are baller once I set aside my (still justified tbh) griping about their removal and really think clearly about their design. First USUM, then liking Lopunny, now this. Wonder what overly dour and miserable old take of mine I will disavow next