It's an experimental hobby distro. If you want something grandma can use, you want to use use something everyone uses.

Chimera is fairly niche and goes against all standards. You're always going to run into Chimera specific issues. Chimera also has a nice transparant build system that one can tinker with.

As for Manjaro, I don't think it's hard to make a distro based on Arch that just works. Manjaro developers just suck.