Any mechanic that one shots other player should be interactable to some degree.

Currently the main way to interact/counter SAM LB is to just ignore him which is pretty much an un-interactable one sided mechanic where once 2 min passes SAM becomes a threat you can't interact with. But well you can also focus other people but some classes have a lot of AoE Ability on their kit so if the SAM get closer to the DRG now the DRG becomes another un-interactable threat that you can't use AoE ability on.

Another common way to counter SAM LB is to CC him. Which I have tried, noticed SAM use his counter ability as a PLD then I bashed him, SAM use Purify then proceeds to one shot me. So now only some CC like polymorph can properly counter SAM

And what if the SAM player is smart enough to not just not tunnelvision

Also PvP is one of the place where numbers DO MATTER, why would you pick a job that just have low potency damage if the other job can deal 20% more damage than you?