This isn't the '40s any more, most people are shooting those bush deer with a bolt gun, and possibly a 3x9 scope. Basically Carlos Hathcock's gear. Many of those same timber hunters shoot groundhogs in the off season, and in the pastures, those ranges can be extreme.
I took an archery tune-up course from a famous PSE archer. We got him out to diner, and he mentioned that they didn't like to talk about it (
), but in Arizona you pretty much needed to be lethal at 80 yards if you want to get your antelope (I consider that an unethical bow shot, but maybe not from a national champion, who had won tournaments at those kinds of range). So for sure, you need to be able to take longer shots, but why does it always seem that bowhunters are still 5X-10X closer than gun hunters.
I hear there is a problem with those canyon busters if they don't happen to be people who know the terrain. And they then find they can't get across. But the thing is that people are sniper LARPing wild today. They have new cartridges and gear that makes longer shots possible, as you mentioned. That is where the current discussion gets frisky. They often aren't aware that those High BC bullets are not terminally optimal across their field of play. They don't know how difficult it can be to find the point of impact once you start walking it up. And they usually have optimistic opinions about the difference between the best shots and groups they made, and what the statistical norm would be for at the range, and how that will degrade in the field. I don' think most people feel 400 yards is extreme, I would not shoot it if I couldn't practice it, and I don't have that range. That may be another advantage to the west, maybe you access to that kind of practice.