Exactly where in the AMA did they say anything that made you think they would have demo summon fewer but more powerful demons?
And there is plenty of caster interaction with demons now.
We do have a default baseline summon that is different than aff and destro, its called a Felguard.
I think most of the changes have been for the better and theres some really fun stuff in there, like summon random demons passively and the Nether Portal functionality. I also really like the Demonic Tyrant, with the option to either spec to have it more often or to sac your imps to buff it (hits like a truck atm).