Thank you for taking the time.

Those launchers will be installed even if you use steam. You are mixing up store and launcher. The launcher often exists to have a viable game without steam running.

Saying it has absolutely nothing to do with it is a bit weird. I have bought most of my games on Steam since 2014, yet I have all the launchers.

Gog is the way to go for non-online games. And all the classics. And yeah, of course, the games often require online components. Not much to be done there. Sometimes, things just die.

Sometimes, they don't. I still run a Trackmania server. Glorious.

So if steam went down, my games with launchers would still work. All others would be a crap shoot, at least until valve releases some offline-steam as a farewell for their customers.

Or they'll have to resort to cracks, which could be illegal, or even criminal in some areas of the world.