User blog comment:Holly Winter19/The "Temporary Paralysis Technique" is Low-key OP/@comment-25156300-20200131004829

I would say its balance is built right in with the skill level factor. If you are just a genin, you would normally never be able to beat a noticeably stronger opponent. However, this move would not be an automatic success for you in this case. It should entirely fail, preventing any cheap wins.

If it's against an opponent closer to your level, then you wouldn't really need to spam this move, since you could fight them without it.

However, I don't see this being a very long lasting effect, regardless. It may not say it requires concentration directly, but I don't see it being able to remain if your attention shifts to another strike. So spamming shouldn't even be possible. Once it ends, a good ninja should be ready to counter before getting caught again.