Who knows, personal experience is anecdotal. If you consider there's fight mechanics that require you to temporarily run out of DPS range, how good the other DPS in your party are (i.e. how quickly things die) everyone experience varies wildly. While i don't doubt u'd run out of TP spamming it for minutes on end against a standalone dummy, live action fights rarely reflects what happens with training dummies beyond using new rotations and gear that increase DPS.

I wont sit here and deny anyone's personal experiences and TP issues but its just not been that case for me. Perhaps its better QoL? Who knows. Although its certainly interesting to hear how quickly people are running out a TP and would certainly explain why there so little use of fracture and Impulse drive.