I have to say, the gameplay i've experienced in CRPG is very different to vanilla. Not at all the same. People are making their own classes based on ways they want to play, skirmishers, two handers, snb, xbow b@stards, cav flankers.
I've had moments where I follow a group of skirms, where I bait cav, where you're trying to get the top player down.
Clans are also much more active with them wearing same colors, coming up with synchronized builds and being very devastating in matches. I made a clan which is meant to counter them called "A Band of Looters" but I pretty much failed as there's only 3 of us in there.
The dynamics of the MP experience is different, and because it's going to be modded further its more fluid and allows for more emerging player habits and cultures.
Having said that, I now enjoy jumping back on vanilla MP because it's more straightforward and I've now grinded practice in crpg so much that I'm amazing at vanilla MP. Everyone using the same kit is also an interesting competition, while CRPG has some super thiccc builds, armor and weaps. It's a different kind of challenge and the murder melee that is all TDM games in vanilla is a unique type of fun. Also crpg don't have sieges atm.
Crpg changes the core experience a lot. I wouldn't say it invalidates vanilla though.
It's been an exceptionally diverse experience so far and adds a lot to the game.
Day one we had 60v60 peasants throwing rocks at each other from across a courtyard. You don't see that in vanilla xD
Does that mean TW should learn from it? Of course. Any successful modification to your game should be studied.