Monal hasn’t been very good about showing you what it sees on your server. This results in debugging issues becoming just a shot in the dark. I did add verbose logging to beta versions but that’s not something the average user has any use for. To rectify that, I am adding new screens that surface what is going on underneath. In addition to the other day’s login status bar notifications, I have added a details button to the server which you can tap on after logging in to see if Monal correctly detects some common, modern XEPs on your server. I hope to make these screens more detailed but this is a start that I hope is useful 
Have you seen how Conversations display this information on Android? It shows a list of XEP features that Conversations supports and which of those are available on the server. Showing features that are unsupported on the server helps both users and server administrators identify which XMPP/Monal features they’re missing out on.
I haven’t seen it. That an interesting approach. I was thinking of making it more like what Adium /pidgin had but the approach of showing everything we support and what the server does is a good idea.