Typically I can't be arsed to watch a 21min video, but here's a summary. Reasons he switched:
- Windows talks to him like he's a baby.
- The bloat is real.
- Customisation.
- gaming on Linux is finally real.
Reason why not switching might be a good idea: you'll likely need to give something up, like he did with Photoshop. (insert his rant about Adobe's abusive practices.)
Most of the video is simply developing on that.
I don't like this guy but I hope this popularises Linux a wee bit. I've seen too many people with false beliefs towards the [eco]system, even without having used it once.