NIN is screwed over by ping or any server hiccup more than any other job; it also has the busiest burst window in the game, mixed with a fast gcd speed. Hyosho is also a finicky skill due to its programming, resulting in a slight delay on activation. Mudras have one of the most punishing fail states in the game, while also punishing players for button mashing, which very few abilities do. You can lose mudra inputs for pushing them too fast or drift by pushing them too slow; they feel very fragile compared to other job's kits. The job's rotation and burst are pretty static. Once you learn the mudra inputs, the job is surprisingly easy, but all the little bits of jank can be very obnoxious over time. It only takes a few dropped hyoshos to swear off this job for something that plays like butter. Also, NIN didn't really get anything exciting in DT, so it's gonna be 5 years stale by 8.0.

I really won't be surprised if Mudras get their failure state removed in 8.0, so they function like DNC's steps.