I've bought many many games on GOG for years because of this. Lately, GOG games come in installers made out of 20 or so parts which take ages to download manually. The only real way to download their games is by using their GOG Galaxy Client. Not that much better than Steam, which on the other hand has fantastic Linux support, while GOG can't be bothered to port their GOG Galaxy client to Linux.
Luckily Lutris allows me to somehow compensate for GOG's lack of interest in Linux, but still, I feel they really do not care about the DRM thing.
I only have 12Mbps DSL and an offline game system that I use a FAT formatted microSD card to transfer to so I appreciate the split files, even though it does get annoying with the huge games.
I agree that GOG's Linux support is minimal; often they don't even provide Linux versions that are available on other stores :(.
Two of the isses on the list account42 links to are more serious, although most are fairly minor (there are also a few issues not on the list). Not to excuse those exceptions, however I don't know of any other store that is anywhere close. I have no inside info but my my suspicion is that many CD Projekt investors resent the DRM-free aspect of GOG and would like it to change, while the people running GOG realize it is the major unique aspect of GOG and trying to change it could sink the business. OTOH, I suspect the CD Projekt investors mostly see GOG as a way to get a better deal from Steam for CDPR games. Hard to say what will happen in the future.
Out of curiosity, which Linux games on GOG are so difficult to install? I have bought many games on GOG and refuse to install galaxy and so far experienced no problems.
I haven't used Galaxy but I'm almost certain the answer is yes since Galaxy doesn't have DRM like other store clients and you see Galaxy related dlls in the standalone installers as well so I'm guessing the integration is the same either way and doesn't cause trouble without Galaxy present. As of semi-recently you can buy games on Epic via Galaxy but if they are DRMed you still need the Epic launcher to play them since GOG won't add DRM to Galaxy.
Luckily Lutris allows me to somehow compensate for GOG's lack of interest in Linux, but still, I feel they really do not care about the DRM thing.