Yes, because all Complications rolled on a spellcasting Mysticism test will only lead to mental damage, which a Mystic usually can recover from quite quickly. I wouldn’t take those devices away from them, as they give the iconic look Mystics have in Mutant Chronicles.
Don’t do that. Ever!
Most spells, even from the higher tiers, require LOTS of Momentum generated by the Mystic. If you raise the Difficulty, they get less Momentum, which makes learning those spells, which is a very XP-expensive thing in the first place, rather ineffectual.
If you feel that a Mystic in your group is too powerful, don’t allow one at all as PC.
I have played a Mystic in a group where we had a fully tricked-out Cybertronic character and a Mishima Martial-Artist with lots of VERY powerful Mutations.
In this kind of group even an experienced Mystic is not too outstandingly powerful.
But any “normal” character couldn’t compete with any of those - Mystics, Cyborgs, Mutants.
The balancing method of choice is: throwing more and increasingly dangerous Dark Legion creatures at your PCs. The Dark Legions have very powerful monsters in their ranks. So powerful, that Mutants and Mystics are not overpowered compared to this kind of opposition.
But that only works out, if you have a group of PCs of similar power level. What challenges a Mystic or a Mutant will outright kill a normal human character.