Developers can do this if they choose to right now.

Most devs would turn off the feature if Steam was just indexing every release and letting people switch to old ones. This is because it will lead to users complaining about old versions for any number of dumb reasons.

At least there is a system build into Steam that allows that. Some games offer such an option even. They just need to expand that option and make it more standard. Also in the past, Steam game updates were not forced and you could stay on an older version. That should be allowed too, at least for non online games.

Captain of Industry has every version before a major release available. The tools are there.

I don't know if you can read or not, but I said its not a bonus anymore. Don't hallucinate stuff I did not say. If I like an update or not, depends on the update. Not every update is a bonus, especially if they have to fix an undercooked game in example. A forced update is not a bonus. I hope that is clear now.

Edit: Sorry for being snarky, but stuff like this (putting things in my mouth I didn't say) gets me.