Everything is good in theory, it can drop 1" at 500 yards. The problem is a good number of "hunters" can't shoot 3" at 100 yards much less 300. So no matter what the bullet actually drops, if you or your gear can't make it happen numbers no longer matter.
Personally have made hits at over a mile on 1/2 moa size targets. People that know me ask how far can you shoot (insert animal here). My response, what are the conditions? Just because I have hit targets at long range doesn't mean I'm willing to shoot an animal at that range. Wind is a bitch and she will humble the best of shooters.
My opinion is if you and the rifle are not capable of holding 1 moa or less this conversation holds no water. Sure the window you are quoting works on paper. Now double that window for a 2moa shooter/rifle. Hell some of the things I have seen at public ranges I would not want some people shooting past 50 yards.
Yes it sounds like a good many here are capable, the new guy (old guys too) getting into this that have never taken a shot at 300 yards might not fully grasp everything that goes into making that shot. They just read on the box of ammo or some chart online that his comb can do it. Not realizing himself/herself may not have the ability to even make the shot.
For myself, I'm not worried how flat something shoots. I want to know how much energy it's showing up with. All my rifles, with exception to the .4 and up and ARs with RDS. Everything is sighted in with a 100 yard zero. My range finder and Kestral are with me. I'll dial elevation and hold wind as to not guess at anything. In Africa my guide was not sure about that. Once he seen how proficient it was, he no longer said anything about it.
YMMV