Patriot, you're trying too hard.If you want to stick with the “Biden didn’t run in 2016” fallacy (he was ordered not to), then you have to recognize that Vance not currently a 2028 candidate. Taking your premise at face value, Trump is doing exactly what Obama did in 2016, and is also following Reagan’s 1988 precedent.
So I have to ask again. Trump has not endorsed a guy who presently is not running, so what’s your point in the OP?
You're right, the fact trump absolutely refuses to endorse his VP (whom he just picked) means nothing.
Let's argue about something else.