Many of the ranges I have been to shooting benches take up the real estate. In some, there is no place to lay a mat and shoot prone with a sling.
The number of people shooting XTC or with a sling has dropped significantly over the years. I attend midrange and long range matches and out of 20-30 shooters, maybe four will be shooting prone with a sling. The rest are shooting with a bipod.
Now the best F Class shooters I know are also outstanding sling shooters, but when I have brought up the topic of why F class has been growing, they agree that one reason is that it is a lot easier to shoot a small group using a bipod, or sandbags.
People are just not shooting standing, sitting, or prone, like they used to. You see this in hunting equipment. There are these bipods that are the length of camera tripods that people are now using hunting because they cannot hold well enough without artificial support.
Now I am proud of my shooting skills shooting standing, sitting, prone, so perhaps I am unfair when I think that sand bag and bench shooters are not real marksman. They are taking the human factor away from shooting and I think that is a very important element in accurate shooting.
But everything changes and perhaps I am only lamenting the change.
At the National Matches, the standing target has a seven inch ten ring. Many High Master shooters put 20 shots, with a high X count, into the ten ring at 200 yards.
Now when the wind picks up, I have been there on one nasty gusty day, and the winning score was only in the 180's. I shot a 168 and felt good.
Scores would be much lower if everyone had to ski a couple of miles and was not allowed to get their heart down before shooting standing. Shooting well under physical stress is very difficult. Scores go down both in cold weather and in above 90's weather. Biathlon shooters are probably excellent shooters, the target they shoot at 50 meters is 1.8 inches in diameter, but they are also under physical stresses that are not conducive to accuracy shooting, I would be pleased to shoot 9 MOA after sprinting for 6.2 miles. I think I would be dead after sprinting 6.2 miles.