I really like the idea of this, but I've run into several installers which are just incompatible with it. I don't remember which ones, unfortunately, but they just didn't deal with it well.
Agreed. I have also found that some (dirt cheap) USB drives are incompatible with Ventoy entirely, being that it does not format the drive properly. I can drop ISOs all I like, but if they don't boot once I select them... Unfortunately I have resorted to using my trusty "pile o' flash drives" I've had for a decade.