To be fair, didn't they actually do that with the UI element it's named after (windows...)?

I think the menu bar, the window with the header bar and the action buttons where all pioneered by them back then, or am I mistaken?

It's been 30 yrs though, so I get what you mean.

IIRC, Microsoft "borrowed" the design from Apple Macintosh, which in turn was based on Xerox's technology. So no, they weren't the pioneers.

That's fair, I think the Microsoft of 30 years ago did pretty well with UIs. That said, given the state of Windows 11 and their other modern products I think their current priorities are quite a bit different.