Windows has an entirely different set of objectives. The coders have to layer on so many services that are insisted upon by marketing that no matter how optimised they make the kernel, it’s always doing to be a little boat carrying far too much cargo.
There’s also a lot of fairly reliable rumour that the Windows codebase is very messy. Evolved and complicated, supporting many obsolete things and has suffered from different managers over the years changing styles and objectives. We don’t know for sure because it’s proprietary.
But that said, I use both and find each good for different things. Windows is much more stable than it used to be, and speed is adequate for most things, largely because we’ve become used to buying better hardware every few years.
Love what these guys are doing.
There’s also a mainboard case, so you don’t need the whole laptoppy thing at all if you don’t want to
https://frame.work/gb/en/products/cooler-master-mainboard-case