The opportunity is there. Great concepts, huge possibilities of accuracy. They just need them to be more simple and fewer orings. This looks like the best one since the OG Boss.
More simple designs with fewer o-rings are already available (Air Force Condor as one example) but a more sophisticated design like a bullpup will require more. Buy what you are comfortable with.
From my experience, unless abused, (static) o-rings have a very long life and o-rings in dynamic (moving parts) applications have good working life spans if properly maintained (kept free of abrasives and lubricated properly).
If you are mechanically inclined, airguns are easy to maintain. Like your car, routine maintenance and replacement of worn parts is expected. Some people are comfortable working on the family car, others bring it to a mechanic.
IMHO, a dozen o-rings, plus or minus, is not going to affect the overall reliability of an airgun. Yeah, each o-ring could possibly be defective or damaged during installation but statically speaking, considering the millions of o-rings in use, the amount that leak is minimal.
Since this is an FX related thread, I just say that I have 5 of their PCPs, all have seen a lot of use over the years and I have yet to have a problem with a failed/leaking o-ring. To put my money where my mouth is, I'm not worried about the o-rings in the Leopard, I have one on order.
I used to design printed circuit boards (PCBs). The whole worry about o-rings reminds me about the old concerns about "vias" (copper plated holes that electrically connect the layers of the PCB). Used to be that every via was considered a liability, a possible failure point to be avoided. Now the PCB in a cell phone has thousands of them and they rarely a problem.
I think that the concern about o-rings is over-blown.
Just my 2 cents.
Cheers!