I have this nagging suspicion that someone initially took a perfectly good Baroque flute and stuck a long foot in it to get the lower notes, and this screwed up the flute’s design, and the process of correcting it took a long time.
On the other hand, some people make short feet for Boehm flutes too… It supposedly makes them more responsive.
Well, yeah, actually if I remember right the low C and C-sharp were among the first keys to be added to the traverso. So a good argument could be made you are exactly right.
Re: short feet for Boehm flutes–there is a price. It makes the 4th octave basically not work.
Both Mike Grinter and Tom Aebi said to me that low keys improve the balance (sound wise) of the flutes.I had low keys added to my Aebi
6/8 months ago and I think they really improved tone and balance of the flute.
I have been worrying about replacing the missing bottom keys on my Boosey Pratten cocus 8 key F flute, but I shall hold things until the research under Professor McGee is presented to the world. Though I suppose I could have the flute completed and then take the keys off !