I haven’t seen this mentioned yet, and there’s a good number of responses so maybe I’m up in the night, but it seems to me Manjaro’s philosophy is somewhat counterintuitive to Arch’s. Arch pointedly obfuscates system internals as little as is reasonable to “keep it simple” from a system perspective. Manjaro simplifies things for the user but creates additional obfuscation. I can see some people who value Arch’s approach being less than amenable to that.

But that’s not a reason to not use it. If Manjaro’s approach appeals to you, use it.

BTW, I don’t use Arch (at the moment)