The appeal of this UI can be boiled down to: form follows function + vintage rendering. Minus the vintage design it's basically isomorph to most common Linux window managers. Be it Cinnamon, xfce, KDE, mate ...

https://imgur.com/a/A3VfeSk

But if there was a good Windows 95 theme I'd probably use it.

Would you consider Chicago95 a good theme? https://github.com/grassmunk/Chicago95