I would agree with you if this was any other genre.
but the thing is, there barely are any good 3D action adventures these days anymore, let alone in the Meteoidvania subgenre, which is basically nonexistent in 3D and is mainly a genre kept alive by 2D low budget titles (like the absolutely brilliant PoP The Lost Crown that everyone should play).
if you have a game in a genre that's nearly dead, being oldschool can be a good thing.
I think this is why so man Zelda fans want the OoT formula back, because Zelda kept oldschool 3D action adventures alive. and when it changed to a more open freeform game with BotW, some saw that as disappointing... sure you'll get the occasional game like Darksiders, but what besides Darksiders 1 and maybe even 2 is there? and these games are already 15 and 13 years old respectively...
the Soul Reaver remaster is one... but, it's a remaster.
other long running franchises like Resident Evil, that maybe started out as action adventures, often morphed into different genres. now the most you'll see in RE are hints at the original action adventures roots but they aren't action adventures anymore ever since RE4.
even modern Tomb Raider games can barely be called action adventures anymore, as they tried to follow the trend set by Uncharted, where action adventure elements are basically faked to give the illusion of gameplay variety.