One major problem is, many ranges don't allow for this type of shooting. I will only practice certain things when I'm at the range alone. My range is 95% old men who shoot skeet, .22 pistols and hunting rifles. I show up with my loud, obnoxious silver box that I drive, get out and start doing reload drills with my AR or drawing and firing with my handguns, I get dirty looks. I don't like attracting attention to myself. Maybe I should drive my Malibu to the range instead of my obnoxious silver thing.
If I get to the range and there are people there, I generally tun around and go home. When the range is empty, I have a field day. Nice thing is, we have covered shooting tables, so I've gone on days where it's POURING down rain, and get the range to myself. It's great. I can truly practice.
I have only once gotten to the range to practice some with my AK and walked up to a guy drawing and shooting. Once he saw me walk up, he stopped and just started shooting normally, so to speak. I just don't think people want to be seen, or bothered when they want to practice their skills in fear they'll get yelled at by a range master (which we don't have at our range) or ridiculed by another member.
That's my take on it.