A clear NO from me.
First and foremost, GitHub Discussions is simply an inferior platform for general community communication compared to Discourse.
It is important to understand the distinction between different types of community interaction. For developers, GitHub already provides the right tools as a natural evolution of developer needs: GitHub Issues for bug reports and feature requests, and GitHub Discussions for broader code and architecture conversations among contributors. These tools grew organically out of how developers work and collaborate, and they serve that audience well. That is where GitHub Discussions belongs and where it works reasonably well.
General community discussion is an entirely different category. It includes support questions from sysadmins and self-hosters, user feedback, how-to threads, announcements, and conversations that have nothing to do with a specific repository or codebase. That is exactly what Discourse was built for, and it excels at it.
If the people proposing this change do not recognize that distinction, then the question itself is based on a false premise: you cannot replace a community forum with a developer tool and call it equivalent.
Audience fragmentation
Splitting discussion “across the relevant repositories” is particularly concerning. Right now, a user with a general ownCloud question can come to one place. With GitHub Discussions spread across repos, where do they post? This creates confusion and fragments institutional knowledge across multiple disconnected threads.
GitHub account as a barrier
Not all ownCloud users are developers. Many are sysadmins, self-hosters, and everyday users who don’t have (and shouldn’t need) a GitHub account to participate in community support. This move effectively raises the bar for participation and risks shrinking the community.
Discoverability and SEO
Discourse forum posts are indexed well by search engines and are highly discoverable. GitHub Discussions is significantly worse at this, meaning years of accumulated community knowledge becomes harder to find, and new users Googling their problems are less likely to land in the right place.
Open source community optics
Moving the primary communication channel onto a Microsoft-owned platform sends a signal that the project is narrowing its focus toward developers only, alienating the broader non-technical community that makes an open source product different from just an open source codebase.
Archiving is a one-way door
Once central.owncloud.org is archived, the vibrant and searchable history becomes a read-only artifact. Community momentum is hard to rebuild once it’s broken.
Before taking that irreversible step, it is worth asking what is actually driving this proposal. If the concern is cost or maintenance burden, there are better paths forward. Consider whether the Discourse instance can be hosted more cheaply, or whether the community itself could help maintain it. That is a far better outcome than losing a decade of community infrastructure.