I live in Anchorage, where it's urban enough that you could hypothetically live a purely urban experience without getting out into the woods . . . but even in Anchorage we have brown and black bears the way places in the Lower 48 have raccoons and coyotes. I like to get out into the wilderness, but there have been multiple bear maulings in the last few years in a city park that's maybe a five minute drive from where I live in mid-town Anchorage.
And besides the bears, we have moose the way most of the Lower 48 has deer. Moose have more of a Castle Doctrine mindset with human encounters than deer, and occasionally smash the hell out of folks who startle them or get too close.
The wolf out on Ft Richardson immediately adjacent to Anchorage that was eating pet dogs and that treed a couple joggers a few years back was maybe a statistical outlier, but the short version of the story is that even in Alaska's only real city of note, you're not terrifically far removed from the wilderness and the potential of having an encounter with animals who are not entirely sold on the premise that human beings are the apex predators at the top of the food chain . . .
Assuming a standing start for the bear at, say, 20 meters, and drawing from the holster against it should make a live fire Tueller drill seem preferable. If you get any rounds off at all before you're looking at ground fighting with a bear, you're already having a good day.
In a perfect world, this is a pretty good idea. If you're on the receiving end of a bear charge, you are definitely already living in a very, very imperfect world. For a scenario where a bear is coming directly at you at typical bear attack ranges, closing the distance as fast as it can, and a second or two earlier you were thinking about anything but an imminent lethal threat, the OODA loop to deliberately select a point of aim isn't going to be workable. Being able to get on the sights at all and not just point shoot at the point blank target horse sized target about to run you over is probably asking a lot of even experienced shooters.