LibreOffice on Windows still uses native Win32 controls. While you could call that a stylistic choice, even Microsoft has abandoned it for new apps.

This kind of UI is a dealbreaker for many new users, especially Gen Zers. How could open source conquer the world without attracting our youngest generations?

They should have bundled GTK like GIMP does. That would make the experience feel much less like it is from the XP era.

(I know these types of comments often get downvoted, but I challenge you to explain why you disagree.)

> even Microsoft has abandoned it for new apps.

Ok, all other things being equal: Microsoft is no longer a good arbiter of UI/UX design.

This is extremely well documented.

Old doesn't automatically mean worse, though I understand that people feel that way on an emotional level when they see old "ugly" UI.