This could maybe be useful if you have a (race) car with a sequential gearbox, but for a regular H-pattern, it seems rather pointless, other than fun and novelty factor.
Exactly, with sequential, I may loose count... in the countrysides of Germany going 145 in my rally car. But for H or HH, I do not really get it other than novelty.
My understanding is that race cars with sequential shifting mostly use dog gearboxes, and having a gearbox that you slam into gear would probably not be very comfortable for the car's occupants vs a gearbox with synchromesh.