I hope not, having a consistent ecosystem where all parts of the system share the same building blocks is one of the beautiful aspects of SerenityOS.

For example in this video Andreas implements palette support for commands (commands are usually shown in the menu bar or contextual menus) and it has the nice side effect of immediately enabling them on every GUI program, even the desktop itself!

https://www.youtube.com/watch?v=LAqGLkRCFb8

I think Zig can be a polite guest in SerenityOS thanks to Zig's general interest in supporting uncommon targets, but the hosts are C++ and Jakt.