Solus 3, as a public ISO is pretty old at this point. Last time I installed from scratch, I had to download pretty much the whole iso again in updates.
My suggestion is to release a blessed updated Solus 3 image. Solus 3.1, or Solus 3.2018 for instance, just so new users aren't put off from the large update. I've created installable ISO's testing the XFS changes I made, which means I had 0 updates waiting for on reboot, which is great for an OS that wants the user to just be able to use the system after install.
I'm not suggesting I do this, as I'm not a committer (just a contributor at this point) to the project, but it would be a good interim solution until Solus 4 is released.
Am I way off base for suggesting this? I don't think I am, but it would save some bandwidth and possibly bring in some new users or contributors.