For what it's worth, blind crosses aren't truly new. They fell out of favor with handlers because so few can perform them with the fluid consistency that handlers like Lisa Frick, Silvia Trkman and Daisy Peel have achieved. They have put in the hours and hours of practice that it takes to clearly cue blind crosses. If you don't take the time to do that, then you will end up with some stupendous train wrecks on course because your dog will be deciding on their own when to go behind you. I'm not saying blind crosses are bad or that I won't ever use them, just that handling fads come and go.
Margaret & Phebe (Wandren Park As You Like It CD RE AXJ OF)