Currently the Mystic is (generally) disliked by most of the community because of how stasising, unless in a coordinated group, is pretty useless outside of the Mystic’s own use, or sometimes saving an ally.
If you look at the Mystic’s orb, you’ll see that tiered and untiered orbs have varying stasis durations. If all orbs had the same stasis duration (maybe except Orb of Conflict), you would have a consistent, memorable stasis duration across the board that knights, archers and etc. can account for in their head and time their abilities to hit an enemy when it leaves stasis. Isn’t that cool too? Stasising an enemy to set them up for a stun or paralyze. (Note this is possible, but rarely unless when coordinated).
On another note, Stasis could also alternatively cause enemies to become targetable and thus able to be affected by debuffs and damage for 0.5-0.75 seconds at the end of the stasis, before they un-stasis and can act. A different solution.