I used to hate Arcane enemies as well, but that was before I learned an important lesson.
“If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.” - Sun Tsu
Arcanes are really easy to spot as shown in this screenshot (I activated GI’s name labels for demonstrational purpose only, it’s not needed at all with a bit of practice):
So once you know how to deal with them and their null ball, they become a minor threat. I really don’t see a reason to remove them from SR.