However, neither have learned the lesson from Valve: make it a really good experience.
GOG still doesn't have as good of support as Valve, and I don't think Epic is even trying with EGS. I'm happy to use a Valve competitor, but they need to make a good product first. GOG is close, and now that they seem to be sharing sales revenue with Heroic, I might buy more from them on my Steam Deck. But Valve just makes everything work so nicely that I'm hard pressed to find a reason to use another.