neumi5694: That's a whole different story. That depends on the games' file structure.
The patches contain the diffferent files from one version to the next. Patches made by an SVN on file base do not change existing files but replace them with the altered ones. This way it's possible to keep a complete history of all versions. But a sometimes even with small changes, many game files or - if it's organized that way - one big archive get updated. In that case the patch becomes quite big. For many games it does not pay off to patch at all, Dying Light being an example. Every patch is almost as big as the entire game.
But patches are still distributed in 4GB chunks. The problem with Cyberpunk 2077 is, that it's one huge file of 100GB with a much higher chance to fail once in a while.
Well, there are storage considerations too. I already have ~12TBs of games here just for Windows and Linux installers in English, French, Japanese and Spanish.
Once you factor in redundancy, add at least 33% to that size if you use erasure coding, or straight up double it if you just duplicate.
And this is for offline storage. Once GOG is gone (hopefully after I'm dead, but I like to keep things real), I'll need cloud storage too to have an offsite backup and at my current size, that's a good 50$-60$ per month for the cheapest dependable online offerings I can find.
Truly redundant (both in terms of physical devices and location) dependable storage ain't cheap.
If I kept a backup of all previous installer versions, I'd have to at least double the size of my collection if not more (some games get updated a lot and not all of them are small).
So yeah, size matters and not just when you are downloading.
Now, if GOG gave me the guarantee that patches only serve to patch previous versions of the installers that are not the latest, I could just delete all my patches without thinking about it, except that they don't.
They jam in 32 bits installers in there (ok, arguably I could probably delete those nowadays), other special version installers and latest patches that never make their way into the main installer (including one for Witcher 3 for the latest French language patch). So I need to review patches on a per-game basis very carefully to figure out what I can delete.