You seem to 'know' a lot about hunting. Tell us, what have you hunted before, and where ? Have you ever been confronted by a wild animal big enough to kill and eat you alive ? ....................... More rounds wont protect you. It is the first and second round that will. Pray and spray does not work in the wilderness when you are alone. Ask any forest ranger. Or an Eskimo in Alaska.
First and foremost, I am not sure sure if your tone is meant to be sarcastic or demeaning, either way, I can assure you I am not trying to offend you in any way. I am simply offering a different, and in my lowly opinion, better solution to the firearm presented in the op.
Secondly, yes I have hunted before in the Florida/Georgia area. I've been hog hunting successfully several times. I am not expert but not a novice either. And given the location of my hunts, I have not come across a bear or other potentially dangerous animal as you described. That said, I do carry a Glock 40 when I hunt in case shtf. I conducted plenty of research online and sought the opinions of many seasoned veterans at local gun shops, ranges, and shows. I am going to link several of the videos/articles I used to help to decide on this purchase.
Video 1 (G20 but very similar gun to G40 just slightly smaller)
Video 2 (G20 again but see above)
Video 3
Article 1 (G20 again)
Article 2 (G20 again)
My over arching point is that while it is most likely you won't need 15-16 rounds, it cannot hurt to have the extra ammo there in case it is ever needed in an unforeseen situation. Shot placement is key as you said earlier but you won't always have that fortune in a bear attack situation. The guy in article 2 accidentally placed a bullet in his foot in addition to killing the bear.
Thirdly, I wonder if we may be talking about the 10mm handgun for different purposes. I am talking about it in terms of self defesne from dangerous animals. The dude in the video you shared was actually hunting with a handgun, which is not too terribly common to my knowledge. So maybe this is part of our misunderstanding/discrepancy earlier?
Again, only trying to have productive dialogue. Hopefully I conveyed my message a little bit more clearly in this post.