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I feel like you're talking about changing a few gear pieces for each situation, while I'm talking about a whole revamp of your character - class, augments, tattoos, full gear change.
To me, changing a gear piece or two is not a respec. And if you did mean the kind of changes I mentioned - I don't think we can do that on the go in Ashes.
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And this is the design/pacing difference in question, and why L2 'can only be merged' with FFXI and like... Neverwinter sort of.
You can regen your MP, positionally, quite easily in FFXI and TL. What you can't do is 'find the time to do that' because everyone's input is required often, this is even somewhat true of Mages.
So yeah, it's about L2's pace of things. Mana regen is abysmally slow even out of combat, so "exiting combat to regen a bit" usually means death of your party or completely meaningless amount of regen.
Like, breaks between pve pulls are usually a few minutes, if the pull depletes all your mana (usually the case on lower lvls during aoe mage farming).
So in my experience I cannot recall a single player who'd just go "ay dudes, I gotta regen my mana, so yall keep fighting at a number disadvantage while I sit on my ass for 5 minutes or so"
This is also the reason why I kept telling mag that I want pvp to completely use up your resources, in that resurrection thread. I'm used to pvps going not only till you run out of mana, but sometimes even beyond that, if the dps from either side dips below the rare party heal from the healers (a rare occurrence, but still).
And this is also why I want deep, extensive and complex mana gameplay between all archetypes. And I want the same in pve, which would bring both closer together class-balance-wise.