amok: which part of any definition of DRM states : "It has to be convenient"?
or is this another case of - "DRM = things I do not like!"
Life is often more complicated than simple hard binary cut-offs. Eg, I own Portal 1 and Half Life 2 on Steam because being Valve games there's zero chance of them ever being sold anywhere else. They are old "finished" games that only need to be downloaded & zipped up once, and then they become "portable" and almost as easy to install as GOG. Today I regard the zip files themselves as DRM-Free. However, other games, eg, if say Divinity Original Sin had released
"Steam-only but DRM-Free", you end up needing the client permanently installed for 2-3 years for 12 patches, then an EE re-release then another 6 EE patches, and have to constantly re-test to make sure of it's DRM-Freeness on every single update by uninstalling / renaming the client back & forth 20 times, etc, then re-package them 20x times over, etc, as a backup just in case the next one has DRM added, and it becomes obvious that isn't functionally anything remotely like being on par with "just downloading & zipping up once like a GOG installer" and that convenience obviously does play a big part in how much of a substitute it can be for a store-provided offline installer.
DRM-Free doesn't require convenience, however when there are many more hoops to jump through when buying from stores that go out of their way to not advertise DRM-Free titles (or guarantee they'll remain so), then it also isn't an unrelated issue either, and whilst the game can eventually become "properly" DRM-Free in the "completed" sense once the updates are finished (as in only then you can "really" uninstall the client), being forced to have a client during that 2-3 year update period certainly doesn't function like "actual" DRM-Free stores. Hence why many people hold off on calling games that need a client to download "DRM-Free", until all updates have been completed and you can actually uninstall the client (and its relationship to that game permanently ceases).