ah, that's what you meant. no I wasn't talking about you. I meant to question the popularity of c frames stemming from what I could call questionable business practices in companies. We in the diy can only hope to copy, we have neither the capital or the manpower to do thousands of hours of engineering work, we can only mimic and that's fine, this is the good side of the internet, a single photo of a frame is enough to give anyone at least a hint of the result of the research.
Companies on the other hand have no excuse, they are already doing the work, they are already paying for it, might as well do something a little more impressive than just copy something that everyone else copied.
Don't let my personal bias for C frames appear to you as if I'm being critical of you. I'm being critical of the thing I talk about. I'm pretty autistic when it comes to people interactions.