I don't know that it's elitism so much as not an interesting problem to solve. Like a lot of software, it's straightforward to automate the easy parts of an installer. But for it to work reliably, you have to account for so many corner cases and that it can become tedious and take a lot of dedication to get right. I think most Arch maintainers would rather spend their time working on Pacman or system stability issues that benefit themselves rather than new users.

I think most people who want easy access to Arch just go with Manjaro, which is close enough and gives you access to the AUR.