Comment by thrower123

There's just an insane amount of UI and code in Windows. I don't even want to hazard a guess how many millions, maybe billions of lines of code it takes to build Windows 10. Nobody is ever going to go through every dialog and update it to the design language of the week, while allocating the testing and QA resources to make sure it all works, in every language. If it ain't broke, don't fix it.

There's a Uservoice thread I've been following for years as comic relief that demands that Microsoft port all of Visual Studio to Linux and Mac. It's the same thing; people largely have no concept how much hoary old code there is lurking there, or how many man-years their "simple" ask entails.