I loved going by myself after I reached 18. I did not like some jws (mutual) and some were very inept and/or abusive to the "householder" insulting even. Some would jump in and interrupt me doing the Genesis to Revelation presentation in 3 minutes. But some neighborhoods were dangerous even for 2 women together. When I was 14, I would be sent off with another 14 year old girl. Now how could we train each other and how safe was that. I have had guns pointed at me and my negotiating training eased that. I have seen drug deals go do and the police invade a house and drag out several men in handcuffs. My generation of jw in my area would not send people one by one. As one elder said, Jesus sent his disciples 2 by 2 and they were men.
I think the WTS is trying to counter the past and current stupidity of jws who avoided previous counsel to be cautious as if an angel was with them.