Whats the 1 thing Project1999 can't revive with Classic Everquest?

[49shadesofgay]

Ambient City/boat music
Forced spellbook meditation
Classic & Velious (pre-luclin customizable) UI
Correct AC and mitigation formulas
Correct damage formulas
client/server mana/hp synchronization (ghost ticks)
Overall difficulty.. this game feels so much easier the way damage/ac/mitigation work than live did

Thats what p99 is missing, but more importantly are the things p99 has no control over that just weren't as present 13 years ago:
extensive voip communication
solid internet connections
knowledgable playerbase
more "mature" (using this in reference to age only) playerbase
Smaller playerbase