Been experimenting with Solus on my spare laptop (haven't switched yet), and honestly, i think that having such an option in the installer would be really nice QOL feature to have, as it would make the Solus experience much easier as you don't have to install updates after install if you don't want to.
This could be really beneficial for those who just wants everything to be ready to go after install, without needing to update. While updates are optional, this could still be a good feature to add in my opinion.
There's a poll here too as you can see, to let you guys, the community decide too.