Well, it might be a little more complicated than just input in that case, since physics/movement is involved. Typically, physics is simulated at a separate (lower) frequency from the graphics, but that's not to say it can't be re-regulated by locking framerates. The tiniest fluctuations in time step can make those simulations behave differently; it's the nature of the beast, and (in real time) can only be reduced or engineered around, not eliminated.
I myself had a very difficult time making the two hardest jumps on the Sightseeing Log because I play on a toaster. One of them required weather to be Rain, so I had to get there way ahead of time and potentially wait hours on RNG*, else GG no re.
* I did this when it was new. People have figured out the weather patterns since then. Also since then, SE has added skywatcher NPCs and relaxed the requirements for similar weather types.