This has been my experience as well. Some things I am naturally right handed at, though, but these things tend to be more full body things like swinging a golf club or baseball bat, using a hockey stick or sword. But I write lefty, use a fork or spoon lefty, use a chef knife lefty, but I have learned to use edc knives right or left. But I've always believed in training both sides, so whatever I can do lefty, I can do righty, though my handwriting will be slower, and not quite as tidy.
I don't get this problem, because I feel the standard vertical carry of a fixed blade is done backwards by most people. Most people with vertical carry of a knife on the hip point the spine forward. To me, it makes more sense the other way because it can be drawn more quickly and efficiently in both forward grip and reverse grip. So the only time I have a problem with right handed sheaths is when the belt attachment feature is integrated and cannot be moved. Not a problem with Spyderco G-clip knives.
Left handed action on right handed folding knives: