This is definitely a huge benefit to kettlebells, and one that has really helped me - as long as I am driving, I can throw in one or two bells. I think the pushback here is that "high level SnC" this will be less of an issue - although depending on the sport, the stage of life, etc. this could become more of an issue. Not every person engaged in "high level SnC" is a full-time professional athlete with an amazing facility to train at. (And that gets back to my problem with the broadness of "high level SnC" - we could be talking about training the Green Bay Packers, or we could be talking about training someone to win the Barkley.)However, what is not highlighted is the portability of these implements. ... I am usually running a specific program with a certain weight and I don't need to lug around the entire set of kettlebells with me. This makes it very convenient. Important rules of habit formation is to make it as easy as possible. ... I've trained barbell but I always had to go to the gym and the moment I had something else happen in life I would have to sacrifice my training because the time investment to go to the gym and get back suddenly starts looking very expensive.
But try playing rugby without spending time under the barbell. I don't know any respectable team that does.
I think these are bad arguments. I don't want to limit it to rugby, any/all sports is fine. But the absence of kettlebelling does not mean that kettlebelling doesn't work unless you can at least find an example that shows a team implemented it (intelligently) and they did awful and that awfulness was primarily attributed to their physical training. This isn't about being "scientific" or doing a "study." You can look at say the NFL team the Titans in 2014 - they won 2/lost 14 games that season. If they had had a good record prior and if they had just implemented kettlebells as primary, then it sure would look bad for the bells. As is, it was the first year with their new head coach. We can obviously talk about the pros and cons of using kettlebells (as we have been doing), but its a very weak argument to say if they did work people would be using them.I'm assuming if A&A programming would work better than many of them would be doing that.
And at least with team sports, the SnC coach is tied to the head coach, and he has to sell the training to the head coach (coach buy in) and then to the athletes (athlete buy in). Now some head coaches might give more leeway and others less, but your job is tied to the teams performance. Are you willing to take a shot and lose your job trying something new? Is the head coach? Is there a motive to innovate - if barbells have been the standard and have worked, why do something different without a good reason? What could you gain with kettlebells that you can't do with the tried-and-true barbell, and is that gain worth risking the careers of at least some of the coaching staff? Shoot it was a hard road to get a lot of sports teams to start lifting weights, let alone lifting them in a way to stimulate strength. It took someone being willing to implement something radical and dominating that made other teams start trying it too.