I agree the docs are often poor and the lack of installer is painful. About 10 years ago, I made an Arch derivative (‘laceOS’) which consisted of a very simple text based installer (answer 5 simple questions and xfce4 and gnatsudio and all then available, common Ada packages were installed). It was intended to be an easy start Ada dev environment. Final user base was … 2 (including myself 
).
I initially chose Arch since I wanted the latest possible package versions. I’ve recently considered reverting to XUbuntu several times, esp since Alire now makes my Arch AUR Ada packages largely redundant.