Quote from Ibtasim6781 :

They will end up leaving once they see how slow updates come.

The problem is that in case LFS wants to make it to Steam, the whole infrastructure would need to change, and the devs would need to focus on it 24/7 (not like abandon their life totally, but mostly). Mods will make LFS last a little bit longer, but it won't last forever.

I'm not saying that bringing LFS to Steam is bad, but at its current status its better not to. It won't make things better.

It can't make things worse so it would definitely be better. Yes players might leave, but at least some will stay. The vast majority of gamers don't even know LFS exists so even just having people playing it in steam friend's lists would promote the game better than now. I don't think much would need to change. Steam has zero quality control and there are a tonne of junk abandoned early access games so if the updates are slow it doesn't matter. Opening the game to the modding of real cars and tracks would pick up that slack and then some!

I just believe that there is currently a huge gap in the market for a good multiplayer racing sim because the multiplayer in all the current sims (outside of iRacing $$$$) are awful and LFS has a great system.

If you put this game on steam and open it up to workshop mods it could become the most popular racing game in the world. Project Cars and AC don't do multiplayer as good as LFS and multiplayer games are the ones that draw in the huge player numbers on steam.