I disagree.. Using lock-on will ensure that ur auto-attacks land when ur moving, and as u all know, we move a lot. particularly in seph first phase where he's moving all over the place. Auto attacks are a big loss for us cus we attack so damn fast.
Yes the idea and discomfort of lock-on is real and I had to get use to it myself, but I suggest u give it a shot.
Here's a few sources u can look at.
[monk] lock target? - Reddit
I use a PS4 controller and I play monk, should I be locking on as often as possible or will my auto attack automatically go as I use my skills? - Reddit
edit:
Why would u even wanna go through that? we're so busy as monks having to press X again each time we move or even use a weapon skill just sounds like unneeded work. Just hit R3 for lock on and ur done, and I think R3 is a lot better than X.