I haven't cleared ES2 but I think the fight is properly tuned. Anyway, gearing to cover up for skill problems is already a thing in FFXIV.

With the upcoming 5.1 people will be available to update their phantasmagoria gear via 24 man raid and a new weapon is also coming via new extreme trial, so DPS increase is going to be noticeable.

Edit: No shame in needing extra gear to clear certain content.