you are kind of doing the same thing.
you generalize based on what you probably have seen while playing.
If I'm running a dungeon and a scholar doesn't use Protect&Stoneskin because "I don't have it"
if I'm running a dungeon and a whm NEVER uses Esuna or don't raises people because "there's the shortcut, use it"
if a dps completely ignores the aggro bar and spam AoEs and attacks ignoring completely the tank
if a tank takes ALL the AoEs from a boss, or can't keep aggro
then yes.
you are bad at what you are doing. and you are a bad player.
and I'm not talking about Sastasha/Tam-Tara or Halatali easy mode.