I agree completely. The “who”, in my opinion, is history and heritage.
You asked about frustration, and I wouldn't characterize what we do as resulting in frustration. We're used to opposing viewpoints, and we've become very adept at creating options and alternatives, which is what we have to have in dealing with our Canadian population.
I would reiterate what Brian said to highlight the idea of some key points that would serve as a starting point, in terms of these being the key elements of what we see, and then we see how that fits. So the family will make their determination as to whether they want the body present or the body not present for the funeral, whether to have cremation before the ceremony or after the ceremony, whether they are honouring the deceased in a casket or in an urn, how the flag is to be positioned when there is an urn—these sorts of things—and create variations and options. As Scott said, we in our community would be delighted to help you understand the variety of options that are available to address the current scenario as we find it in Canada.