The biggest problem with phase advance was people carrying it out below 100' RA. They click forward, click back to climb, and suddenly full climb thrust is commanded as the autothrust has turned itself off.
There it is right there. Why would you want to bounce in and out of different levels of automation on final? You don't have time to figure out what's going on if you screw it up or don't react fast enough.
That's why its a crap procedure. You cannot possibly be stabilized when your degrading automation and then upgrading it again.