Having to build from source is exactly why I don't think the AUR has a replacement. There are many similar package managers but non as extensive. Like NUR for NixOS.
I would really like if the metadata included some recipes to install the games in different systems because I find using DRM-free games on Linux much harder than on Windows. Perhaps it's the lack of practice.
PPAs aren't convenient at all compared to the AUR. Pacstall is the AUR for Ubuntu it just needs more packages. I would still be on Linux Mint if Pacstall was as extensive as the AUR.
Please, read the post. Nobody asked you this.