A 20 hour RPG becomes a 50 hour RPG with just have turn base battles basically. Very convenient way to make your game <longer>.
^This.
Essentially, for TB fans, RTwP makes combat chaotic and difficult so let's replace that with a system that makes combat stupid and boring and tedious and a huge waste of my time. I wish all TB combat games came with an auto-resolve button so I can quickly move on past the pointless and painful combat.