A little history.
If it wasn't for the DIR movement the back plate as we know it today would not be in mainstream use. I say "mainstream" in the context of the internet and people who frequent the boards. Anybody who has hung out on any scuba related message boards in the last 12 years probably knows what a BP/W is regardless whether they use one or not. People who just go into their LDS and are oblivious to BP/W because the LDS doesn't carry them and the customer never goes on the internet is living in the overall mainstream, yes, but they and their LDS's are also in a parallel universe.
Because the DIR movement was instrumental in bringing the BP/W out of the cave and wrecks and into our mainstream, I'm going to go out on a limb here and say that possibly most BP/W users are either fully certified DIR or at least dive a loose DIR configuration and follow the rules as closely as they know how.
I started using conventional plates this way and did a few years of tech diving myself through TDI, although I never took fundies.
The Freedom plate has it's roots from somewhere else. It is drawn from the old school of the back pack. I developed the modern version 10 years ago after I decided I didn't want to do tech diving anymore but wanted a plate that was more comfortable than what I was using, which was an OMS plate (which I modified BTW).
So from that the Freedom Plate was born but it never was intended to be a tech plate. It was just supposed to be a simple single tank plate but do the job very well.
From that standpoint I decided to market it to people who knew what plates are, but I hit a roadblock exactly with the issues that are being discussed in this thread, can't use doubles, can't use argon, blah, blah.
The vintage divers don't want it because it's not "vintage" enough.
The LDS's - forget it, remember they are in a parallel universe.
So far the ones that use it most are recreational single tank jacket BC converts who will never dive doubles and never use argon bottles
But there still is a good chunk of people who are getting into BP/W who look to you guys (DIR) to see what you use and why.
So for me to break into the DIR market would be huge, because with that endorsement it would mean it could be used anywhere for anything by anybody.
After all, if it wasn't for DIR the rest of us would still be using jackets.
People need to remember that.