Much to the production is shown in "fast forward" for most repair, maintenance, crafting, cooking, and baking videos for a reason. The video would take a lot longer, repetitive actions are dull to watch if they're very basic. The sped-up action is arguably eye-catching and also implies simplicity to a novice and expert alike. Lastly, people prefer a shorter video than a longer one; a presentation that seeks to not bore the audience is important.
Still, it bugs me if a critical step is left out in a video; say, if something is already partially disassembled but there's no previous video nor how-to instructions to get to that step or process...
(Now parge the lath!)