Every scout needs to have the basic skillset, and then the more advanced skills if you continue in the trade. The problem with overreliance on teamwork is that it tends to make some people more passive. So, while such people could still do something in the group, they actually can't necessarily do it on their own or if they suddenly had to lead people knowing less than they do. At least back in my youth, in the scouts, we had to clear a long list of tasks requiring some skill and knowledge. Many of those skills were tested individually. Scout organisations also arrange regularly competitions where members test their mettle against others, for those interested in such contests.