GOG Galaxy 2.0 is advertised as a central hub for own entire PC gaming library, but every time I reinstall it and give the app a chance, I am let down by the broken integrations. Offline, offline, offline. Hit retry, nothing. Disconnect the integration, log in again, and a few days later it's broken again. This is across multiple PCs and most certainly not a user issue.

Does GOG not invest any development resources into this product? Ever since the beta of GG 2.0, integrations have been a sloppy mess. Am I missing something or is it really just that bad?

I think integrations are maintained by users, not Gog.
I guess they advertised the hub possibility, but then they washed their hands about it..

There's only 2 official integrations (Xbox and Epic). The rest are community based. Sadly, Galaxy development slowed down a lot during the past year or so. Progress is basically non-existent.