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There's no "support" associated with arcanist or even using a topaz/titan in most circumstances. You're fighting with the tank for aggro, which can shift enemy positionals.
>The "Support" aspect is not exclusive to arcanist, and is done equally by any competent scholar or even summoner. I really have a hard time understanding what you mean by this, unless you're talkinga bout virus and eye for an eye (which again, are not exclusive to just arcanist)
>If you try to take up healing, chances are it's not very much since physic is quite literally the only healing spell you'd have as an arcanist. Unless the tank is severely overgeared, your heals would barely catch up with anything, though honestly there's a big problem if it comes to relying on arcanist heals in a typical party setup.
You mention you do all of this in WoD. At this point in the game, I usually see people who slack or straight up troll in WoD by crossing provoke, auto-attack afk, or w/e. The way i see it though? If you're playing as an arcanist, you're straight up lowering your overall damage output (which is what you're queuing as, a damage dealer) by foreging abilties like fester and overall lower pet potencies with a topaz, your heals won't ever break 800 to clutch anything.
In the end, it really does not have a place in end game content even if you do get the gear level. You'd only end up holding back your entire party because your dps has a very very low celling as an arcanist, and problems can arise with a topaz/titan egi fighting for aggro on adds or bahamut himself (on top of the lost damage/contagion). It'll also bother some players if you're the one that's slowing down the party in a farm or expert dungeon by anywhere from 3-10 minutes per clear.
For general play with friends? Go nuts. That's probably what the low level content was for anyway. It's so incredibly loose that a THM crossing physic can easily keep the entire party up, and dps can spam their 1 aibltiy and not slow the entire dungeon by 10+ minutes