I believe it was simplified to try & make PVP more accessible for all players. Many players get overwhelmed with the expanding amount of job actions & combos that they panic during PVP & hit there combos improperly. We can argue that (if you aren't ready for PVP, you shouldn't be playing it) but SE wanted PVP to be played by more players. I believe the changes are extremely useful, the only thing is, you'll have to readjust to your new PVP specific action bar setup. As a healer, I don't have combo buttons, however, it's much more enjoyable & simply to worry about 8 - 10 actions rather than 20+.