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Who'd have thought not actually owning the games you purchase was a bad idea?
Even if you buy them on gog you don't own them. Download and keep - sure, but you could do that with many games on steam too (also you could download torrent versions which wouldn't be different from buying on gog). The point is about actually keeping these copies alive, properly updated and working, for which these services exist.
So, I think owning a disc is also risky, that means your copy can degrade. Owning games in this context have lost its meaning for me.
When you own the game you have the choice whether to back up the game and whether to keep a computer that can run it.
Both of those mean you have to own a physical thing. Store services are basically backups for cases when you stop owning a physical thing for a while.