I wont say it's garbage but...
We can say Thrash has stagnated. It's been staganated for a long time.
Death Metal may have started out sounding like Death and Possessed but it branched out into so many different sounds.
Black Metal is literally limitless in how it can sound.
Thrash? Thrash is thrash. It's basically the same shit as it was, but with now with weaker more sterile production.
It's not terribly interesting to me. I can completley get by for the rest of my life never ever hearing a new thrash record. I'd just stick to my favorites.
If Megadeth, Slayer, Metallica all quit after 1990, what value was lost??!?!?