Gajim will have some more of that in the next version, Monocles or Cheogram have more modern features than Conversations and Siskin is very outdated feature wise and you should probably replace it with Monal.
That said it is not true that the three clients you mentioned have none of that. Sure they don't have all of it, and there is some feature mismatch between them, but you are making it sound much worse than it is.
Oh and you can always use Movim which has most of the features you mentioned.