the Linux kernel and its applications are majorly backed and developed by american companies and their employers.
And this is the problem, considering that Linux has been written by Linus Torvalds, a European. The base and the majority of developers should have remained in Europe, but unfortunately a mistake has been done.
Oh, I did not know about the possibility of replacing xfwm4 with i3. I too am using i3 for some years and like a lot to have a clean surface which facilitates focussing on my tasks. However, never thought about integrating it in a DE.