I think you are wrong here.
A President does not have to be the smartest man in the room. He has to be smart enough to realize his own limits and smart enough to surround himself with the best advisers he can get. And then he has to be willing to take their advice.
The thing he needs in addition to intelligence is big brass balls that clang together when he walks. This is where many fall short.
Based on actual results in life, Trump has demonstrated that he is qualified. He has demonstrated this through success in business, not politics, but he has quite thoroughly demonstrated it.
Unfortunately Trump has never demonstrated any consistency.
He’s got a record of conservatism stretching back several weeks.