3/4 of the fights feel like they are REALLY on the DPS. The only fight where I felt significant pressure to perform as a healer was A4, and none of the mechanics in the fights seem particularly rough on tanks. I haven't done EX primals but I've seen sentiments that both Bismarck and Ravana EX are mostly DPS checks as well... not sure if S-E is just trying to push DPS players harder or what.