According to many, Windows UI/UX peaked in the Win2k/XP/Win7 era.
Among those, significant improvements: memory management, new/more stable drivers, 64-bit support, better use of multi-core cpu's, etc.
But since then: increased telem.. ehm, spying. Pushing ads everywhere. Mostly pointless UI overhauls again & again for little end-user benefit. If any.
It's sad that giants like MS seem so hell-bent on enshittifying their flagship products. Just imagine what could have been if MS had kept supporting, improving internals, and adding drivers to the 'oldie' OSes mentioned above. Or stick to minor upgrades leaving OS look & feel intact.
Sure there's tech limitations. But I dare you: name some application(s) that would be impossible on say, Win7 due to fundamental issues in its design (assuming MS & app developer were both on board to smooth out wrinkles). Anyone?