What if a mechanical did not loose KE, could be shot at any angle, has large cutting diameters, was stronger than any fixed broadhead, and flies like a field point? Would you use it to shoot any game in the woods?
If it was also capable of comparable penetration to fixed blade heads. If it gave comparable reliability, not opening in flight but opening easily when it should. I might consider using mechanicals if all those conditions were met. It's not likely that head will ever be made though.
There is still a legal technicality with most mechanicals. They could be considerred illegal in those states with laws against using barbed heads, since the back of the blades is at an angle more than 90 degrees from the ferrule when they're open. If the head hits bone and bends the ferrule, the blades could be jammed open. That would make the mechanical a barbed head. I'd hate to be the one trying to explain it to a judge.