I've heard that with the height, the reduced speed allows a shorter brake run. I'd imagine some of it comes down to cost.
Also, it allows an extra block section. B&M seems to add double block sections, versus say Intamin and Superman SFNE, where the ending brake run is literally the block section before the station. If for some reason the first brake fails, friction brakes fail, and the backup generators go out (never going to happen), you have an extra block section to stop the train from crashing into the next. Versus Superman SFNE, there's no MCBR, only one brake section in between trains, so if everything fails (again, never going to happen), the trains would collide.
Over engineering is one of the reasons why B&M has a pretty much flawless track record. They add an extra block section every time where un needed.
Plus the height allows more block sections because of the reduced speed and shorter brake run needed.
It could also be so they can squeeze an extra airtime section in there. I don't know if that slope after the first brake run is counted as one or two block sections, and same with the straight before the station. Is that one or two block sections? I don't know. either way, my final guess is: Extra block sections and airtime moment, the extra material needed for the height is minimal. Also, the way the train stops as the front car is slowly going over the crest not really getting airtime teases you to want to re-ride and the view is cool, makes you remember how tall the lift was