I didn't consider that. (never having had long nails myself)vometia wrote: ↑17 Aug 2019, 12:59Random comment about spherical vs. cylindrical which is that it may have been at the behest of the typists. I've mentioned on my MX Black Impressions topic that the gf borrowed my keyboard with the SA profile and didn't care for it. The main reason is because she has long nails which would catch on the top edge, something that seems to happen less with cylindricals. I keep my nails short so it doesn't bother me; I'm also clumsier than her so I prefer the more bowl-shaped keys!
Completely anecdotal so it may have absolutely nothing whatsoever to do with the rationale of the design. But it's good enough to put it on Wikipedia.
I did notice that in movies and TV before the 80's, secretaries often used pencils to dial rotary phones - possibly because their long nails would snag or break.