I had IPS with most of the apps minus commerce and Pages and Recently I had to migrate to XenForo.
The main reason is that my users come from Discord (thats the only place I'm able to get people from to join) I've also been waiting on the Discord Integration but the Dev for that app is AWOL. And in Xenforo there's a better integration. 2 of them actually and either works great.
But what made me leave the most was the lack of a Chat app. All we have in IPS is the Free Chatbox everyone downloads/uses. But my members didn't like it because they couldn't create rooms or Personal Message one another.
I feel IPS or a 3rd party should create an app like this one: https://xenforo.com/community/resources/chat-2-by-siropu.5762/
a lot of people actually left Discord and began to use my site when I installed Chat By Siropu and my site's activity has gone up by a lot.
But I, personally prefer IPS. This is my home pretty much. I feel awkward in XenForo and I would like to see someone create a chat application as good as that one I linked or if IPS could make something like this native in 4.4.x The Gallery over there sucks, The Resource Manager sucks, and there's no Blogs (for 2.x) I would love to return and renew if we had a chat option like that on IPS.