I was just thinking along those lines.
In order to be well-practiced, the individual must be free to practice at his convenience, and as much as he feels comfortable with.
This is also a perfect illustration of the dangers in changing semantics.
Marriage comes to mind....
Well regulated means “in good working order” like a well-maintained machine. A militia that is well regulated has to be well trained and well equipped. Modern threats include random violence so carrying is necessary. It include riots so semi-auto with high capacity is required.