A lot of it is, but it can be for practical reasons like range ammo or self defense rounds where you really wouldn't want to use rounds meant to stop a grizzly bear (like 200 gr hardcast lead) on a human attacker because it would zip right through them and hit an unintended target. A jacketed hollowpoint that isn't going quite as fast will still stop a person, and the recoil will be lessened.

Same for range ammo: If you're doing drills it would be very expensive to use something like Underwood or Buffalo Bore every time, so people use less expensive ammo instead. Shooting hundreds or even thousands of rounds will also beat you up a lot more with the heavier rounds with more force behind them.

For anyone considering 10mm for back country carry: It's still a good idea to get some practice in with the rounds you'd actually carry on the trail because shot placement is pretty damn important if you're trying to stop a grizzly bear - you need to be able to handle follow up shots with the extra recoil or you're way better off just carrying bear spray and bear bangers.

Carrying a firearm without adequate training is way, waaaay more dangerous to everyone than any grizzly bear. Also, even if you are trained and competent under normal circumstances, getting charged by a grizzly bear is fucking terrifying, making shots while experiencing an adrenaline dump is not easy.

Anyhow, this concludes my lecture, apologies to everyone who fell asleep.