by no means its in "final stage", they are just not going to follow official with updates
L2 has so much content before GoD (up to H5 i count normal L2), that generally this is not even half way used potential
- Goddard area (IT/HS/FoG), Innadril area(fields of silence and second fields), Rune area(FoTD, stakato nest, Monastery of silence), whole Hellbound, whole Gracia continent (SoD/SoA/SoI with flying ships and transforms)
- S grade armors, S80 armors (HB farming and HB pvps), vespers (gracia continent)
- attribute system (different than whats on official right now, maybe some tweak of old attribute system? who knows)
- still missing lots of skills for classes, which can be added later to be farmed in several different ways in new locations
- from epic bosses - Frintezza / Freya / Valakas / Beleth / Tiat / Ekimus
- there are just few people 83, they didnt even reach 85 cap, but i dont think there is problem even if you can go higher than that, as long as classic system is kept (or leave it 85 cap, but i think leveling is big part of motivation why ppl go outside of town and grind)
- kamaels (now dont take me wrong, not necessarily new ones from classic as they are crap, also not necessarily old ones as they were OP, but possibly old ones being tweaked so they are not so OP OP, but generally decent)
- improved pets (kookaburas/wolves, eventho i think wolves were kinda toxic for gameplay back in the time)
possibilities are limitless, ofc i am not saying they should implement everything i wrote above and even if they decide so, it would take literally decade to get to that stage i believe, but pretty much anything you saw up to H5 (and maybe even some GoD features which are nice and not really out of l2 world) can be potentially implemented in the future. they are just done with blindly following official classic updates.