I play on ps4, both NA and EU, and it's almost always full.
Honestly have no idea what you're talking about.
Unless you are on really late, there's almost always groups.
It's always full any given evening and even on weekends. However, the game might still be alive and well, but, with all the lagging, weapon/skills misfiring or delayed, weapon swapping malfunction and other technical crapshoots, you (well, your toon) just die a lot.