seams Intamin is going for short forceful bursts of strong LSM rather than a full line of weaker LSM might be for power efficiency?
With the retractable brakes on the HP attraction but not in the dueling invert not having its prob due to roll back distance.
The new hp coaster will have lots of block sections with multiple trains on the track, while the dueling will prob only have 1 train on the main running block at once so stopping has more distance
with the switch track and drop track and multiple trains. when this ride needs to stop in a emergency/ block error (which causes auto e-stop) the ride will need to stop quickly. the lims can do it partly
I think universal wasted the retractable brakes as a extra saftey mesure, plus it stops the train alot quicker when needed