Oh, if that's the way you want to go. Yes. You may recall that during the campaign, I started a thread titled "Is Trump Smart?" There were too many threads about Trump at the time, so it got closed down in a consolidation. But this is a fascinating question to me. He has none of the traditional markers of intelligence, or even minimal mental competence. And yet he has been remarkably successful on some terms. There are certain things that the likes of me can know only in a rational, theoretical sense, but that I think he's picked up in a practical way. But they're a kind of intelligence. I can often explain after the fact, using some training I have as a rhetoritician, how it is that one of Trump's tweets or comments has the effect that it does, in fact how it's perfectly calibrated to have just that effect. But I couldn't have concocted it in the first place. He's got an intuitive feel for rhetoric in the age of mass communication. But it lets him do things that I have to label with some positive term (at the intellectual level; at the moral level they're uniformly reprehensible).
He's ignorant and proud of it. He doesn't have a lot of book learning. I think it is a mistake to believe he is stupid, though. He just operates only for himself in a way that most other people don't. A lot of the cases where people are calling him stupid, they are using a different set of parameters for whatever actions or statements are at issue than he is.
His very way of speaking is probably the prime example. He has a distinctive way of constructing sentences, which serves multiple purposes. For one thing it's a populist touch - not many people talk like Barack Obama does, for all his charisma. The ambiguity of Trump's constructions fools people like
@Manfred Belheim into thinking he was just talking about the criminal gangs, just talking about people who break the law, etc, rather than "all immigrants" or whatever. It allows him just enough deniability to where his real supporters know exactly what he means but he can still deny it in "respectable" company. And finally, and possibly most important, his weird way of speaking lures liberals into mocking him, except when they do that, they are playing right into his hands, by playing the caricature of the "liberal elitist".
So liberals who call Trump's way of speaking "stupid" are judging it by a different standard than Trump judges it. But Trump's statements almost always accomplish their purpose, while liberals who call them stupid almost always play right into his hands and ultimately help to accomplish his purposes too.
EDIT: As for the last bit of your post - I don't think the fact that it's an era of mass communication has anything real to do with it. I think Trump has a high amount of emotional intelligence which he's cultivated over the years of experience at marketing stuff. At heart that's what he is - a marketer, a promoter, a showman.