About a week late to this conversation but I also would love a minimum install version. I understand Solus aims to provide sane defaults and for users new to Linux that is great and there is a great selection. However for people who have been using Linux for over a decade, there are packages we already use (either for familiarity or preference) instead of some of these defaults and there are choices made that we would never make. Yes I can just remove these as always said in these discussions but personally I would rather build up than strip down. A minimal install would be for more advanced users who choose to use Solus instead of say Arch or Gentoo.
Anyway, I also understand that Solus does not have as much manpower and maybe if that grew this might change so I'm not suggesting it should be done immediately. But I did want to give further reasons for why this is requested and show there are a few users who would like this.