TP doesn't seem important to exist. Just a bar that drains slowly then gets restored by yourself or a party member. I don't really see why sprint need to cost it all either. They gave sprint no TP cost in pvp but not in pve.

At least MP has more impact on gameplay rotations such as controlling how often BLM needs to switch from astral fire to umbral ice and causing DRK to use attacks to maintain their MP.