I know of several vendors that will not build a unit that does not have down legs in the front, along with myself, I'm a builder but do not consider myself a vendor.
I have watched the BC video and yes it worked, would I want to bet my life on it? No. However it is better than nothing at all and I would rather see someone run it vs nothing. I consider crawlers edge the same, there is no significant structure in the windshield frame. Now if it had reinforcements for the windshield frame and door pillar area I'd be all for it. I may just be a bit over criticle and probably over engineering it. My take on it is always what's my life, my wife's life and my kids life worth? I'll over do it every time, and that's how I look at for my customers as well. And yes I've been upside down more times than I can count doing things that the risk was known. It's the ones that aren't known that will jump up and bite in ways that are unimaginable.
I said it earlier and will elaborate. I've put Bailie's basic family cage in 2 bone stock restored bronco's that were really nice. Both of them drove better by being more responsive and felt more rigid like a modern vehicle. They were also quieter with fewer rattles creaks and moans