I don't think they're interchangeable (I wouldn't recommend someone using Manjaro just switch to Arch if they're not either willing to learn or already knowledg

I don't think they're interchangeable (I wouldn't recommend someone using Manjaro just switch to Arch if they're not either willing to learn or already knowledgeable), but specifically where stability is concerned -- anecdotally yes, I've had more issues to debug on Manjaro than on Arch. I haven't tried EndeavourOS or any of the other Manjaro replacements, but next time that I need to set up a Linux computer quickly and don't have the patience to set up Arch, I probably will try one of them. I will say in Manjaro's defense that even with some of its weirdness, I think I've had fewer issues on Manjaro than I have on Debian-based systems like Ubuntu. But I don't think that's a fair comparison because I haven't used Ubuntu in a while and I wasn't running it in parallel to Manjaro. So I suspect some of the increased stability has come from just general Linux progress and me knowing more about how to keep a computer stable.