The videos are for entertainment, and they demonstrate what it is possible to do with a bass. It is exactly because it's not the ideal instrument that it provides entertainment. You could stick all the notes into a sequencer and press play and it would produce the same tune, but it wouldn't be in the slightest impressive.
As John F Kennedy said, "We choose to play bass on Youtube and do the other things, not because they are easy, but because they are hard; because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one we intend to win, and the others, too."