They actually did auto-position based on the mechanic, iirc. It wasn't just saving him the tedium of placing them, Paisley had a serious threat to future raid design.
Take a look at Timestop, Wormhole & the beginning of the transition to perfect in their clear video. You'll see all 5-6 markers adjust within <1s very blatantly, something no human could do. The only time Kio ever put down waymarkers manually was for the trines and that was it. Even then, it was only a single waymark to indicate the end point; which is why Square destroyed waymarking mid combat. TPS created a dangerous precedent in future raid design where Paisley could immensely lessen the difficulty of encounters by having dynamic waymarkers that could change in an instant, even in the middle of a mechanic.
Could you imagine something like Basic, Intermediate or Advanced relativity, only you get assigned a waymark at the beginning of the fight and then you just go to all the places it pops up during the mechanic to auto win without even having to think about positioning? Paisley's use in TPS was just the surface of what it could do, hence why Square saw the need to break it before it spiraled out of control.