Agreed. It makes sure player do mechs, because players don't want that, but also lowers difficulty : E10S is super quick to learn cause most failures don't kill you, making you able to go longer and see the mechs more often. Two issues however with that, one has been said already :

- getting a damage down when you fail : fair enough. Getting one for OTHER players messing up ? Not ok. Not sure it's going towards less toxicity in PF if your parse is ruined by someone else fucking something up not so badly that you still kill in the end. Actually I suspect if that happens you will see people actively sabotaging kills if some damage down happen. I know I'd be very displeased when I do a really good rotation that would turn into a shit parse because we were two on some orbs instead of three. Since fflogs doesn't rank on pps but dps, it's a shame.

- this introduces a discrepancy between tanks and invuln cheese like E9S anti air. GNB and PLD are fine, DRK and WAR can't cheese without damage down because of the way it is coded (looks as simple as dmg <> 0 then debuff, lol)