The feature those provide isn't immediately obvious in a static screenshot, the tabs are "magnetic" and you can take your "word" application and "stick" it's tab next to your email tab, and now you have a "tabbed application" with the email app tab on the left, and the word app tab on the right. You might have one "window" that is your front end dev workflow (firefox, vscode, 2-3 term windows) with 5 tabs, and then a second window that is your backend workflow of vscode + 4 terminal tabs, and a database workflow that is pgadmin + 2 terminal tabs. For example. I haven't seen anything like it, and I'm not sure how it handles windows with a smaller fixed window size, like winamp.

I really like the linux solution here. My windows have no titlebar/borders at all. To move a window hold the window key and drag the window from anywhere, to resize hold the window key and right-click drag.

And yes I know it's not really a linux specific thing, but that gets the point across. It is very common on linux. I could twirl my os/desktop hipster mustache and say "my obsd/spectrwm desktop handles no window chrome really well" but then I feel really pretentious instead of only slightly.