I do remember and it restricted the user way less than Valve’s DRM. What kind of argument is this anyway? We were also abused in the past (just less), so abuse is good?

Being abused less is an improvement.

Inserting a disc (or mounting it is an ISO) is more annoying than installing a proprietary app on every device and logging in to your account?

Yes, but only because valve has made it seamless for me. If they go the route of media streaming services are currently going then it wouldn't be.

It certainly was better, since our rights were abused less. I can’t tell if it was cheaper, though. But since you used to be able to sell games that you no longer played, I assume that it was. I can’t sell my Steam games or trade them for other games.

I never bothered to sell a PC game. My friends that sold games barely did, and didn't get a reasonable amount when they did. Console games sold reliably, but were still a mediocre return on games that rarely dropped much in price even when used.

If you want DRM games then GoG has you covered, go with them. I don't because it would be slightly less convenience at the same price for no real benefit to me. They should exist and I'm glad they do, but that doesn't mean that every storefront needs to be the same if there are benefits worth the tradeoff.