I run a site for owners of a very specific model of RV, of which they only made less than 2,000, and who knows how many are still on the road (they ended production in 2000).
There’s also a Facebook group. The Facebook group is good for general conversation - hey, I’ll be in Colorado, anyone near there? - but for technical issues, it’s frustrating, because if someone does answer the question, it’s difficult to find in the future. And Facebook’s algorithms mean that the topics aren’t presented in time order or anything like that, so you can easily miss a post that has something important to you but isn’t a major discussion topic.
And then, it’s all controlled by a company, so if Facebook decides to clean up old stuff tomorrow, there’s nothing we can do. “But it’s so hard to use the forum!” because I have self registration turned off and you have to email me for an account (spammers). Meanwhile the Facebook group gets t-shirt spammers about twice a month.
It drives me nuts.
You’re correct, though my forum could be archived on the Internet archive (I’m not sure if it is, but it could be).
I agree with your general point though, there are still single points of failure in Lemmy.