I like open sight's but not my choice for a hunting rifle. Beside's that my old eye's just don't work as well as they did in my prime. Using fixed sights you have three focus point's, rear sight, front sight and target, no one's eyes can focus on three point's at the dame time. The cross wires in a scope I focus looking into the sky and looking through a scope, everything is on the same focal plane. But get into power and I'm pretty much a low power scope guy. I have a fixed 2 3/4x on my elk rifle. If that doesn't let me see and animal the size of an elk well enough, I'm way to far off. It also really gives me a wide field of view, no problem at all getting on target and it really gather's light. If you can't see well enough to shoot well with this scope, you shouldn't be shooting in the first place. I also have a straight 4x on a 22 mag. Works well enough for anything I'd hunt at any reasonable range. I have 2- 2-7x scope's and think they might be the answer to the best power range for a variable hunting scope. I seldom use them above 2x except for sighting in. I also have two 3-9x scopes. Got them because at the time I couldn't find 2-7x scopes. One is on my 25-06 and one on a 243. If I were to shoot long range, 300+ yds, at a small critter, for sure I'd go to a higher power. All I have killed with the 25-06 is deer and one antelope, have never had the scope over 3x to do it! The 243 is a play toy for me, I don't hunt with it but if I did I would still likely only use it on 3x! a deer even at 300yds, I've only shot big game one time out there, still make's a big target even at 3x! The other 243 has a 4 3/4x14x scope on it. Again it's just a toy. The scope came off my 6.5x06 and just swapped the scopes out. Were I to be shooting at sage rat's at long range, the target is very small and higher power would be very good to have to see the target with. My longest shor ever attempted was a good hit on a gopher at 330 paces on flat ground with a 223 using a 3-9x scope. Even at 9x the target was very small but not so small that more than one shot was needed!
I doubt that most young people today have ever tried hunting with a low fixed power scope, 4x or below. As a result they have no idea what it is like to shoot through one. They go to the range, jack the power all the way up at 100 yds on a 4" or bigger bullseye thinking the can shoot better because they see the aiming point better. The thing they actually see better is their breathing! The aiming point's on my sight target's are max 2" for the low power's. For the larger power's 1" and at 6x I have no trouble seeing a 1' aiming point and my breathing is not that noticeable. But the truth is, if it works for you, it works. I shot small bore match in the service and a guy on the team way Olympic class shooter. His match rifle weighted close to 15# and wore a fixed 20x scope to shoot at 50' target's, if it works, it works. I never out shot him!