As I see it, one DRM-free store is enough.
— this is ok as long as that store is doing what you want, remains open, and releases things you are interested in though. If you were happy with one status quo, why not stay with steam, bigger catalog, more established etc…
And you might as well stick with the established one that more or less pioneered the whole thing and despite the few questionable decisions/gaffes/shortcomings over the years - that have yet to significantly affect my personal experience with GOG and make me leave for greener pastures - still has the necessary reputation making it more likelier to stay around and continue to slowly but surely grow for years to come.
— well, not sure they pioneered it so much. Some a niche and exploited perhaps. DRM is something which gets added to a product, products were available before without drm. And lots of other work had been done on compatability before gog, dosbox for example, drm removal patches etc.
As long as there are offline installers, a continuous influx of new as well as old classic games and Galaxy staying optional and the fuck out of my singleplayer experience I'm sticking around, exclusively.
— it’s not optional in an increasing amount of instances, even offline installers contain parts of galaxy.
Especially now that GOG seemingly continues to make an effort to make good on and correct past mistakes by bringing formerly rejected games such as Agony on board.
— could you give one example of where gog has made an effort/fixed something. I can off the bat give you quite a few where they did not. Forums, broken, search, broken, changelogs, not present/not update/obfuscated, no ability to download older versions or patches, removed content and compatability from newer versions, feature parity withother stores lacking, poorly optimised installers lacking decent compression, dreadful communication, “galaxy day”, the list goes on.
Sorry to seem a bit harsh, but you have only been here a year, and surely you must have seen all this already?