You're so strong! You have mmy support! (ノω<。)ノ))☆.。

I believe they would have anosognosia, which would lead them to not reflect and/or believe not much is wrong with their actions being disordered. Having them being a difficult individual to convince to believe something is wrong with them

TYSM 💖 and def, because their fixation would also be something that adds to their ego, feeling as if they're "better" for improving their knowledge/skills by these fixations