For example, the biggest issue is that the Candidate be a lifelong, true-blue Republican. We are long past the days where we could pick up a stray Democrat to run for us, and there are not currently any of those broad brush faction movements ~ e.g. Southern whites from Democrat to Republican, or practicing Catholics from Democrat to Republican.
So it's time to focus on the Republican street cred of any particular candidate for President.
Out of the 16 known registered serious candidates for President this year only 3 were lifelong Republican Conservatives!
Two of them were technically residents of Virginia, so they couldn't both run as President and Vice President ~ the third one may also have resided in Virginia for a while in a previous job.
So, where did those other 13 come from and why should we have entertained their running in OUR primaries?
We failed to protect the value of our brand. That's not good for downstream sales.
So there is no room in your philosophy for anyone to ever change. In other words you're a purist. You would have sat out 1980 and refused to vote for Reagan.
Congrats.