Basically what IverCoder said, but also sometimes I like not having to tinker with my desktop at all. I'm running through an Arch Install on my Thinkpad right now just for the fun of it and I do love this kind of thing, but I'll admit the concept of plugging in a USB stick, installing a distro in one click, downloading my apps through Flatpak and not having to mess with the CLI a whole bunch is very appealing. Yes you can do that with Ubuntu or whatever but (at least in my workflow) you still have to mess with the CLI a bit.

Basically, I like messing with Linux sometimes but other times I just want a, I suppose Windows-like experience while still having Linux under the hood.