Pure horsesh*t. The radius makes near zero difference.
I'm going to have to agree and disagree with you.
If we are talking shooting groups or bullseye shooting where you have ample time to align your sights and press the shot off, then yes, a short vs long sight radius makes less of a difference, but it still makes a difference.
If we are talking 3 gun or any other action shooting sport where tenths of a second make the difference between first place and "thanks for coming out", then the longer the sight radius, the better chance you have of hitting your target while on the clock.
In most, if not all, the major 3gun matches, paper targets are one A zone or two anywhere on paper.
As long as my front blade is anywhere in my rear sight's notch, I'm breaking the shot.
Now lets say my front blade is firmly against the left side of my rear notch and I have daylight on the right side.
Short sight radius will send the shot further left than a long sight radius with the same sight picture.
That could be the difference between an A vs a C, C vs D, or D vs miss!
I'll take all the help I can get and use a firearm with the longest sight radius possible.
If I was using a glock in 3 gun, I'd be buying a 17L.
My rifle has a 20" barrel and my front sight is as far forward on that barrel as I can get it.
I don't care how good someone's fundamentals are, when your on the clock everyone's grip and trigger press breaks down at some point.
Like I said, I'll take all the help I can get.