@
eschwartz - you need to ask Kovid your 'what's the point question'. Maybe you want to minimise the number of file types on your system
One thing I know from
decades of supporting tech, is that the less choices people have in their
day-to-day usage of tech the more productive they are - in this instance productive would be books read per year.
If you normally want
old and occasionally
new you could remove AZW3 from available output formats. and change the MOBI File type rather than Output type. I venture most Joe and Jane's would prefer OldKindle and NewKindle rather than MOBI, AZW3, KF8... alphabet soup
BR