The cost of those hooks themselves is negligble and statistically insignificant. It would take great effort to measure such a change in performance, and would not take up more than a millionth of the total runtime. Unused hooks are not a performance concern.
The real concern here is that unnecessary complexity has been added that will show in the future as technical debt. I also notice you’ve wrapped all your functions in {} then again in a function exists check, both of which aren’t necessary