The original question from the OP^^^
Has this not already been answered 100-fold?
Isnt it enough to say the trend is a result of people seeing enough hard evidence the small cartridges reliably produce plenty-sufficient wounds and ethical kills, while also recoiling less, which combo is beneficial for reasons ranging from cost of shooting, more fun to shoot without recoil, easier/faster follow up shots when needed, and shot-spotting when needed?
Re: recoil resulting in better hit rates. I am certain I have read at least 1 scientific study on this which pretty definitively said lower recoil results in higher hit rates among military recruits or something like that. But I dont have that link. If someone does, maybe it would help with the constant “yes it does”…“No it doesnt”…“Yes it does”…“No it doesnt”…
Failing that, wouldnt it be fun to actually test? Ie do the hunting rifle drill with a 223 and then do it with a similar “big gun”. If a bunch of people do it we could probably come up with a pretty definitive answer.