Well it's a pity you seem to have a negative inclination toward RBs now. It was the case early on that the pool of knowledge regarding the safe operation of RBs was limited. There was a spate of accidents due to what were at the time "received wisdoms" of how things were done.
Now that it has matured somewhat and many of the fault modalities have been identified and corrected/mitigated it is less of a "crap shoot".
It is still inherently riskier than OC but IMO some rewards are worth increased risk.
Better PO2 monitoring in the form of more reliable O2 sensors will be a welcome thing!
Oh and as to your query over why they don't have the same RBs in the video. My take is that it's not necessary, they were diving autonomously so little is to be gained by having the same gear. Sure you can share spare parts if you have a gear failure whilst topside but if you didn't buy gear with a particular buddy in mind then it's awfully expensive re-buying simply to take advantage of that.
Love the condescension. SB is not RB world, or whatever it's called these days. I have a pool of experience and knowledge with RB's and technical diving since it's early incept. With that I've seen enough in the way of accidents and macho bravado to seriously doubt the benefit of human exploration into areas where it can be done better with a ROV, or not at all. It's not very pretty when you see guys you know and love come up dead, or go missing. And with a high degree of regularity. The final straw for me was when Wes Skiles died. This was shortly after I had conducted some fairly dicey, ugly penetrations in a remote area where help was not accessible for days - or if at all. On concluding these penetrations I seriously debated the idea of worth & purpose. Explorers will always argue for 'human eyes' seeing things for the first time, but IMO - it's all about ego and not really about purpose. I know many will not find my particular viewpoint favorable, but at the end of the day I am still alive among my cohort of early adopters. I consider myself only lucky even with better technology.
Your take on solo RB cave penetration - is this first hand knowledge? Funny, that parts of the penetration dives were videotaped meaning someone was holding a camera. What was the cameraman using? A KISS? So do me favor - don't talk too high from your pulpit until you see enough in the way of serious mishaps and malfunctions to make you wonder why and what for.
X