I'm sure you're right! Trouble is - for me - there's actually too much to be bothered with when there's still so much to work on in conventional tuning. Hence the consigning of the partial capo to the shelf.

I spend a huge amount of time transcribing jazz and other tunes for guitar - the impetus for which is the tune itself. I rather think that the impetus for using a partial capo is probably the partial capo itself, rather than the tune... :-)