Hi Timelord - I never felt the need for one - but that doesn’t mean much. I’d certainly not want another voice in the cockpit. Perhaps a system you could disable Fencing In and enable Fencing Out?
FWIW I do believe that affordability is an issue. Money spent on a system - mandatory or discretionary, is money that can’t be spent elsewhere. Not saying it shouldn’t be spent on CWS, merely that if you want CWS something has to give.