I would much rather emulate linux apps on a more stable and consistent OS than vice versa. The sheer number of toolkits and window managers leaves my head spinning, and unifying their behavior even before you can begin to improve it feels like a nightmare.

I personally don't care much about the dock or the look and feel or whatever; I just want access to the usability of macos without having to accept how closed it is.

It's hard to get a more consistent and stable kernel than Linux, not counting academic or experimental kernels w/o extensive hardware support.

If it is no longer closed, it might proliferate just like Linux once it gathers a critical amount of users. :)