I use total commander and x-plore. I would use only TC but sometimes i can’t overwrite files, while x-plore can overwrite most of the time. I would not recommend x-plore becouse it has ads (with adaway i don’t see) and is not opensource (i think).

Never liked it on pc, but I have it on phone and love the ability to have 2 dirs open at the same time.

Zygisk is part of magisk. Might be wrong but its just root method used by magisk.

It doesn’t really matter if it’s usefull for others. Write it for yourself and learn from it. I myself wrote copying script for terminal and I am sure no one else going to use it just me and thats fine.