UML not maintained anymore?

[Natale Patriciello]

It seems there is no interest in fixing bugs (such as [1]). Moreover,
same guest filesystem (same host os, distribution, etc.) on two
different machines (i7-2630 the first, i7-7700HQ the second) yield
different results, with crashes and corruption of filesystem in the
modern computer.  So, can I consider UML as a legacy thing in the Linux
kernel? With what I can replace it (I'm doing TCP research, and I focus
on the networking stack)?

Thank you

[1] https://sourceforge.net/p/user-mode-linux/mailman/message/35663374/