Well, some of that "progress", I can live without it.
If they remove Slashback I wouldn't miss it.
Force Breaks... well, chars are receiving shitloads of movements. I think a cleanup would be necessary, and if Force Breaks get removed in the process, I think it's just something natural.
But well, out of that, I don't see what else they would remove. Rest of the subsystems, they've been around since GG1 or GGX.