Would it make any difference at all if they were in 3/8?
I've often wondered the same myself?! I wonder what others think?
I see a kind of "musical inflation" at work here.
It's worth remembering that the longest note currently available to composing mortals is the Breve, worth two semibreves.
But
breve means "a short/quick note"? And indeed it always used to be, back in the C12-13th, those organa were flying-around in breves. Semi-breves... well, nothing could be shorter than half a quick note!!
Yet today we see time-signatures like 3/16 and don't think they're unusual?