Add to that you've already undermined your own point by saying experience is not important if you win an election.
I never said that at all.
What I've said is that since the 1800s every PM has had experience in one of the great offices of state or as leader of the opposition. Clearly the whole point of being leader of the opposition is that it shadows and prepares you to be PM. And to become PM from leader of the opposition you'd need not just to have the experience of that role, but to be successful in that role as to become PM you'd need to won the general election from opposition.
So the point remains - Tugendhat, Mourdant, Badenoch or Braverman (and actually Zahawi) are painfully inexperienced compared to their predecessor PMs all of who (since 1900) had been Chancellor, Foreign Secretary, Home Secretary or a winning Leader of the opposition.
And actually, were you to ask which of the PMs over the past 120 years was least experienced, then probably Johnson, with a tenure of less than two years as Foreign Secretary.