I'm not much Dragon Ball expert specially not of last 20 years(i guess? lol), but by random news internet threw at me Broly got very recent canon appearance, and by classic DB logic anything that appear today is waaay stronger than enemies of the past for the simple fact Goku keep getting stronger and new villains needs to be strong enough to make him seem the underdog
Plus Broly is sayan and in DB they get upgraded up to the power writer want them to be with zero fucks given lol
Feels is Buu got surpassed by bunch of colorful rubber made aliens Toryama (or whoever else does DB these days) designed to be new villains... Buu was a thing like in the 90s lol