xizar: You're missing the point of how updates are managed in general between the two platforms. Steam auto-updates. GoG requires a manual reinstall (and perhaps uninstall as well, it seems.)
TheEnigmaticT: In this *specific* case? Yes. In general, though? No. We've patched a number of games with a patcher that updates the game incrementally as you'd expect instead of requiring an uninstall and reinstall. As for auto-updating, there are quite a few reasons why you might not want to be forced to update your game. We'd rather let you make that decision yourself.
I tend to trust that game updates happen for a good reason, though for older games, I can see where this would be a bad thing, considering there are many which have communities outside the original developers that mod the game to fix bugs and such.
VtM:Bloodlines is one I have auto-update turned off on Steam because of that kind of situation.
But, as I said, I wish I'd gotten a Steam code for this because that platform also tells me when the game gets patched.
To be honest, the only reason I knew about The Witcher 2 EE is because of the advert on Steam. The only reason I knew about TW1:EE is because Steam auto-updated the version I have through them. This, despite the fact that I purchased both Witchers through GoG.
The same thing happened with LoG. I didn't know about the update to this until I saw a note about it on Steam.
I like that stuff from GoG is DRM free. Steam's DRM, however, comes with sufficient other services that I'm cool with using it.