Going out on a tangent is a normal part of having any lengthy conversation.
We all do it.
But in the age of teleprompters that is missing in speeches. And after 6+ years of someone who is a master teleprompter reader but a horrible leader. Its nice seeing someone that can speak off the cuff like that.
Bear in mind Trump is 69. There’s no way an ordinary person can do that at 69 unless he or her has significantly high brain function. I still think it’s highly unusual for an elderly man especially.