When Is Standover Height Insufficient?

Steve Sr. wrote:

So far I have had a test fitting on the new bike but haven't been able
to ride it since the seat post provided was too long (won't go low
enough). I can just barely straddle the bar with bike shoes on. I
would estimate that there is currently somewhere 0-1/4" clearance if I
stand just right. The bike currently has 23mm tires on it but I will
probably switch to 25mm when these wear out to reduce the chance for
flats. This will only make the stand over height worse.

I think the key is the word test, the bike builder will report the
clearance issue, back to the frame builder, who, if they are good, will
make some adjustments, and it will all work out....

W