well there is the default style for openbsd's fvwm. clear borders, grab handles, contrasting fg/bg colors. But I won't go so far as to say it is decent.

https://debugpointnews.com/wp-content/uploads/2023/04/OpenBS...

Anyhow it's bold to claim that there are no linux window managers to rival win8, linux is like the paleozoic of desktop interfaces. It has the opposite problem there are too many of the infernal things.