DeadPoolX: GOG's now following the "so long as it looks pretty it doesn't matter how well it functions" philosophy. To be fair, Valve did the same thing with its new Steam client that's terrible compared to the old one. I guess GOG felt left out and had to "improve" Galaxy the same way.
Truth007: I prefer the new steam client to the old one. it's more cohesive and looks better visually.
Well, visually, I disagree, it doesn't fit with the look of the rest of the client or any part of the Steam website or anything else connected to Steam as a platform. The old library did fit with the rest of the client, and was simpler and more intuitive to use on multiple levels for most people. Functionally it's missing a bunch of useful features the old client had (including really basic stuff like being able to launch on the library page and actually have the last-played game's details showing). And it has persistent performance problems on a large number of PCs even after multiple post-launch attempts at fixing problems, with some systems that never had issues with the old client not even able to run it (including high-end nearly brand new systems where it's not a "stop using a potato" problem). Several performance-impacting functions which were supposed to disable in low performance mode were confirmed not to be doing so in beta, and they patched multiple problems of this type at least 3 times each after the official launch before fixing them. Then there's the still-present memory leak which has been shown on multiple occasions to cause system crashes and which they knew about before launch and still haven't done anything about.
And of course the fact that it's directly causing medical problems for a number of users, which is a pretty solid reason to say they should have put it right back into beta the moment they found out that was a problem. And I've seen confirmation that they knew it was a problem within days of the launch if not before, and my contact with support has led to it being made clear that the people responsible are not just failing to fix it but actively refusing to even try. And that's been ongoing for 6 months and they're still doing nothing about it.
So that's a bunch of good reasons why it should be optional at best and there's an even stronger case for the Steam client to belong in an "opt in only" state than there is for Galaxy 2.0, and there's no way I'd argue that Galaxy should be forced onto users like it is currently. Obviously, since I'm saying the exact opposite:
https://www.gog.com/forum/general_beta_gog_galaxy_2.0/open_letter_to_gog_and_message_to_support