probably because someone could change their split times, but that would only be those people that know how to speedrun games but are too lazy to do one.

Gothic is probably going to correct me on this one, just expecting it

i might be wrong, but i think it's depended on your angle when you hit the stairs, it's not about mashing as fast as you can, you have to get a certain angle and mash when you think you've landed on the stairs. Some people might disagree with me on this.