I’m one of the admins for a 82K+ member org, we’ve used Discourse as our internal forum for discussion, debate, resource sharing (thanks to the Docs feature!) and, a Convention Hub for our bi-annual conventions to propose resolutions and collect signatories for them along with posting announcements to the delegation body.
It’s worked great, like any tool (to also repeat what Lilly said above), you need to clearly establish the goal for the tool and ensure membership buy-in, but it’s worked great for us so it should be an easy sell.