A really big problem I feel is the disparity between how healing resources are used in normal content vs hard content. I mentioned this earlier, but in normal content as a Sage, I heal almost entirely with two buttons plus the free healing from Kardia: Kerachole and Ixochole. These cooldowns are so short, and Addersgall is generated at such a rapid pace that fight design cannot keep up. I waste more Druocholes on myself just to regain MP than I actually heal with Kerachole and Ixochole. The entire rest of my healing library is almost completely ignored--reserved only for mistakes that I can't resolve with Kerachole and Ixochole, and even then, we're talking about a single Physis II or Pneuma on rare occasions. Then if we look over to savage, you will use at least most of your healing resources regularly and potentially push you to use GCD healing on occasion.
These two experiences feel like different games, when it wasn't always like that. Because we weren't drowning in healing cooldowns once upon a time, it felt like even though normal content would demand healing at different frequencies than harder content, both created environments where the majority of your healing had a place. You'd have a few healing cooldowns, but you'd need to rely on healing spells as well even in normal environments. You'd heal with them less than you might in savage, but every tool had a purpose. Now, we're swimming in healing cooldowns and DPS refunds.