Why would they do this?
Potential Liability
Think about it: some idiot pioneer runs over somebody while struggling to 'get their time in'. Then, some clever lawyer determines that they are 'employees' of the Branch, to an extent - or that some sense of agency applies. So, the Watchtower has to cough up a million here and there.
This already happened with at least one Bethelite. And case law in the US may be drifting into applying lawsuits to corporations that have appointed, trained volunteers.
The above is why I keep saying that they are taking a huge risk with Circuit Overseers as employees of the WTS.
metatron