As you stated, it's your opinion.
Here's mine - if you run into a big black bear (300 lb or better), a REALLY HOT 180 grain .357 load is marginal, at best, and a 158 grain load isn't even in the running.
Given anything other than an absolutely perfect shot, it just doesn't have the ooomph; and all it takes to have a less than perfect shot is to have the animal move at the instant you squeeze the trigger.... a VERY common occurrance.
You owe it to the animal who's life you're taking to do everything you can to make it a quick, humane kill. That requires that you be able to place your shot properly, and that you use enough gun.