Or you have multiple camera angles and you switch between them to hide the cuts. Like they've done in movies forever. People started doing jump cuts in youtube videos and for some reason we're stuck with it.
Not exactly. Most movies use https://en.wikipedia.org/wiki/Single-camera_setup, so even though there might be cuts to different camera angles, each angle actually comes from different takes. The goal of different angles isn't really to cut out pauses/fillers, it's for stylistic/cinematography reasons.
>People started doing jump cuts in youtube videos and for some reason we're stuck with it.
Probably because setting up multiple cameras and lighting them is cost prohibitive for low budget videos on youtube?
Yes. One classic example is in a scene with two people speaking, you have two different camera angles to switch focus between them.
More generally, film makers who want to focus / depth-of-field effects very often do so with two cameras / takes where the focus is already set. Changing focus in the middle of a shot is very jarring.
Incidentally, this is something that became immediately obvious to me when I started to use my DSLR for video.