Remember Surrender to Madness in early Legion? Remember BFA Void Form, pop it multiple times in a trash pack, get insane haste and feel but also be skill dependend strong while competing the insanity minigame?
Now it is just press button a,b,c and wait for resource and press and done. Wait for cooldown - like any other class - and done. It is literally the worst caster in terms of gameplay and used to be the best especially in early StM. High risk - high reward.
Very sad to see this development starting with Shadowlands. SP was once great. And for people that cant remember or didnt really experience the state before:
Shadow priest became a Shadow of itself.