Ifrit EX was horrible design for the same reason though - and you can't tell me that you can accurately identify 20% on that HP bar without third party tools.

This is the horrible design in the same way that a mechanic forcing healers to not act for 30 seconds or tanks to not do anything for 30 seconds is bad design. Or how certain fights have tanks in extremely trivial roles (Titan HM, Levi EX MT).