I don’t see them as different modes.
They have plenty of games to reference that include both solo players and parties in the same pool and maybe its a pipedream that arena can get to that point
I don’t think Fire mage players like having a purgable combust and non threatning damage otherwise. Being as frontloaded as they are now wasn’t a thing in legion iirc.
They’ve tried different approaches like HP % damage in lasso/gpie and to a lesser extent controlled burn
but I digress
I don’t think WoW is somehow the only game where you either have coordinated surgical precision in setups or everyone runs around with their head cut off ala Solo Q and there’s no inbetween.
It could be as simple as faster dampening and that’s something the devs will wrestle with and dare I say use something like solo shuffle as an additional metric.
but im prob fried idk