I have a similar preference, in that I either play single player (presumably, 'story mode'), or with a select
and local group of friends. Most of the time, that mesns two of us, 'co-op' mode.
And I'm equipped to do that entirely locally.
Most of my machines, including the ones I use for gaming, don't have a net connection, and they don't have it for several reasons, among which are not needing it, and security. Anything requiring ANY form of online authentication, therefore, is a major headache at best, and a non-starter typically.
Also, I'm just not prepared to spend hundreds or thousands of pounds, over a period, on games where ANY company can decide I've somehow breached it's T&C's and can effectively render that expenditure useless from that point on, at any time between today and some unknown future point in time, by locking my account. I often go back, years later, and replay games I really enjoyed. Like, right now, Thief (v1) and a couple of the Myst series. That might be months, even years later. I still have the (working) hardware necessary to play Apple II games, bought before a "PC" was even a twinkle in IBMs eyes. Hell, that was late 70s.
Yeah, extreme I know, but I'm just not forking out forty or fifty quid a time for games Steam can render useless any time they wish. I have no real objection to effective DRM, however much a pain, like CD check, provided that on buying it, I can install and re-install when I wish, without getting online permission.
So for me, moving away from Steam
could be highly interesting
provided it doesn't mean substituting one form of online authentication for another equally unacceptable, and probably less polished, form.
If it does, it's back to waiting to see what appears on GOG, etc. And, happily, saving a flipping fortune over release prices in the process. As I'm not really interested in online multiplayer gaming anyway (done it in the past, got bored with it), failing to keep up with the latest releases doesn't bother me.
Very definitely, I suspect, I'm in a minority and probably a small one, or Steam, for all the other benefits, would have died out years ago.