I think that the P99 in 40 S&W is probably similar to the original Glock 40 - that, and it's lightweight. I think that contributes to the snap.
I find the love affair folks have for the 10mm to be an interesting development, and I'm not sure why there is the belief that 9mm/45ACP is suddenly not enough gun. Then again, there are plenty of folks out there chomping on the bit to get their hands on a 500 S&W Magnum. I'm not one of them. I have a 44 Mag, and that's enough for me. (For that matter I also have a 41 magnum, and that out-performs the 10mm every day of the week in all aspects but capacity.)
The big issue with the 10mm and 45 is the grip size from a double-stack magazine being too large for persons with smaller hands to grip. Not having a good grip and higher recoil don't mix well.
That is why Glock produced the small frame versions and then the gen 4 & 5 modular grip sizes.