There is an Arch-based distro called Antergos, and this is basically what it does. However, Antergos isn't a tailored suite. It's just Arch (barebones, limited packages to be installed... a little over 500Mb) plus 6 minimal desktops (which make up the rest of the 1.9Gb).
Solus is intended to be a complete DE and competent alternative to Windows or OSX. If they attempted to do what you're asking, they'd either have to make considerable compromises or release a 4Gb+ .iso. Neither would be a popular choice.
I made a post recently suggesting what I feel would be a suitable alternative. (Shameless plug in 3... 2... 1...) A net-installer...
Manjaro's net-installer--called the Architect build--allows the user to partition, format, and mount any/all drives, install the base system--including optional development packages and kernel of choice--then install one of a dozen DE's (three supported and several community-maintained) or choose CLI only... Then, the user can choose a minimal install, full suite, or personally select all required packages to be installed.
It's awesome. It's easy. It's an excellent way to learn. If I ever had Ikey's ear, I would insist that this is a must for any distribution.