Look, I loved Sebilis and Guk as much as anyone. There is a special place in my heart for truly massive amazing dungeons like that. Black Rock Depths is another I love a lot.
Am I going to go into Neo-Guk and sit on a waitlist so I can sit in a camp and grind mobs? I am absolutely not doing that. You need to instance you don't really have any other options here.
I mean, you can skip instancing I guess but you create the exact situation Everquest had. The very best spots were blocked by various obstacles. Such as keys or just difficulty in getting there (City of Mist, gay ass Siren's Grotto, and so on). So you had remote dungeons with no traffic and thus no groups at them. Or high traffic because of good items and accessibility (SolB, Guk). Sebilis being an outlier because it was in BFE but once you were out there you were committed for literal weeks at a time in many cases. If not far longer.
Knowing you are going to have THOSE EXACT SAME FUCKING PROBLEMS. Why would you do it?