We used vBulletin from 2008 to 2018. (before that we were using disqus, and even before that we were using something else that I can’t remember - it was from 1996 to 1999).
Some features we were using with vBulletin that are not (exactly) available in Discourse, were the blogs, galleries and groups (vbulletin groups were similar to fb groups). When we migrated to Discourse, all three features were missed at first, but we found out that most of them added unnecessary clutter to our community and moved the focus away from discussion.
We were using blogs for member creations, but we substituted them with forum topics.
We were using groups for teams interested in specific aspects of our community. But we just phased them out and moved the discussions on the main forum. This actually increased engagement and awareness of all topics.
The same applied to galleries too…
So… the verdict was: too much clutter with no direct value to the community and actually sometimes detrimental effect to the cohesion of the discussions.
Nahh, we won’t miss it at all!