PVP in mmos are hardly real time.
Looks like real time to me.
Maybe my definition of real time is incorrect. But you don't point and click in MMOs generally, it is all aoe spells or targetted abilities. There are big margins of time or spell aoe to overcome delays of network packets.
People, I don't even get what you're discussing here. That TCP should be fine for any game's network code because it works for WoW?
.5 - 1 seconds of delay may not seem like much, but it actually adds up to be quite significant because of the global cooldown would also be enforce client side and so a player with higher delay would have done fewer actions in the same amount of time.
Your spell interruption example illustrates it perfectly - spells can be interrupted if the interrupt is within the 1-2s cast time of the spell. It's adjudicated on server side, where the server knows the spellcast start and sends feedback on the spell results (including if any interrupts happened). If there is minimal delay then it works without being noticed; however when I had significant packet loss, then the spellcasting would 'end' for me only after the response (including check if it was interrupted) was received, and it could be multiple seconds later.
The point is, that WoW can mostly function if the orders and feedback are received with delays, since if some opponent in reality(server) is somewhere else than I see, then it usually doesn't change anything - but for a rapid movement FPS game, that would change hits to misses which is the core of that game.