The skills arent even the same and some with completely different functions. It makes one feel completely disconnected from the class one love.

The ability to even think of outplaying your opponent is gone with such a limited toolkit (though, as you said hit detection and muddines between interaction of players is something that needs fixing as well).

And again, the classes play completely different compared to their pve counterpart.

Example, ninja.

Wanna hide/stealth? Ninki, also dont get hit for 3 seconds.
Mudras? Gone, replaced with ninki since it's apparently too hard for some people to weave mudras together with their movement.

And while TCJ might not be the optimal skill to use in pvp due to its immediate limitation it's still something that would be FUN to use given the right circumstances.
And, I think most nins love the animation of suiton -> TA, well its gone (yea hide-assassinate brings similar result with increased damage but it isnt the same, both in setup (clunky) and visually.

IF by some chance some skills would prove to be a bit too much (say, BLM triple cast) a nerf instead of outright removal might be better.