I think it completely depends on the needs and types of discussions.
In the adapted lens sub it‘s a mess currently because the main features don‘t work anymore and (if they don‘t decide to include post titles) much of the archive that particular forum served as, is basically gone for good. That‘s unique information about hundreds of old lenses, some of them having been the only mention on the whole web… I‘m sure that‘s not the case with most subs but in some in-depth ones very important context and connections are now just missing.
Of course there are always alternative ways to do things in the future, but it makes me hesitate to put much effort into stuff to be honest.