I think what this proves is that you only need very few buttons to fulfill your role as a healer (just 5 buttons, an ST heal, an AoE heal, an emergency instant heal, Esuna and Raise) and the rest of the kit can be used to flesh out the flavour of that healer job.
Alisaie in that dungeon proves that you don't need 20 buttons in your kit that's just a basic heal button. SE should learn from that and actually use all that free space to flesh out each healer job instead of slapping on a bunch of "Heal for X" buttons just because it's a healer job.