It's just how substats work in 14, unfortunately. We have very little substat deviation with builds, unlike WoW where some builds scale with different substats.

Here it's, generally, as much crit as you can get, followed by direct hit, skill/spell speed to comfort, and det when you can't do anything else.
You have very few deviations from this, such as spell speed black mage, because unfortunately crit is king.

In WoW, some specs prefer haste over other stats, some specs prefer mastery over other stats, some specs prefer crit over other stats.

Welcome to 14's job/combat design.