I watched Hill Billy Elegy, which is the life story of JD Vance. It then hit me, he is already someone of a cultural icon, just like Trump himself.
Politics is all about selling yourself and a myriad of ways to do it, but without charisma and notoriety, you better have a ton of cash and the media behind you. Having a ton of cash and the media behind you is often how the Left sells us their politician, in combination of promoting the cult of party, which is selling the notion that everyone is Hitler but them and only they are free from racism and bigotry, etc.
Being a Republican, you don't have the media behind you and will probably not have the loads of cash the DNC normally has to push across candidates like Kamala Harris who neither has charisma or any notoriety outside of politics. So, as a Republican, you better have charisma and/or notoriety, both of which JD has. And like it or not, Trump has charisma, even though he can be abrasive and unlikeable, he also had notoriety combined with the charisma. Because of this notoriety Trump had coming into politics, it is simply harder to sell the notion that a money man like Trump is actually turned into a racist KKK member overnight when he decided to make the fateful decision to enter the dirty world of politics. Trump even dated a black woman for two years and at one point asked Oprah to be his VP bfore entering the world of politics. Again, when Trump asked Oprah to be his VP, it was with the knowledge he knew politics was entertainment. He wanted to sell his brand. Likewise, it will be harder to sell JD to the American public as a racist KKK member himself, especially that he married a wife that is a "darky". But you know they will still try, because they always do. It is all they know really. It is who they have become.
But back to Harris, even with a ton of cash and the media behind you like Harris, you are left with forced public appearances and debates where the truth gets harder and harder to warp into the propaganda talking points you wish to use to sell the candidate, much like continuing to sell Joe Biden as he publicly can't link two words together to complete a sentence.
I think this is the main reason Trump disdains politicians like DeSantis. He simply lacks the charisma and notoriety needed to win as President.
Sadly, what is needed to win elections is not what is needed to judge the best people to get elected, but that is life. At the same time, just because they may be entertainers also does not mean they are not the best people for the job either. All you can do is hope you get lucky as they end up being one of the best people for the job.