I disagree. Not everyone wants to spend the time to completely customize their system. Distros like Manjaro and Endeavor give people a decent "just works" install while still giving them experience with the Arch ecosystem. The forums are usually a good resource, and everything on the arch wiki still applies. It might just be because I had previous linux experience, but I've learned a lot running Manjaro.
The average person is not going to jump straight into vanilla Arch as their first distro, but after a couple years with Manjaro, they might try it.