I have to disagree on this. I've ridden with ergons for a bunch of years and I found that once you figure out the slight downward angle (my preference) then it's pretty much set. I've used them on three bikes and I find therm to really reduce pressure points.
Not sure why or what you disagree, it looks like we saying the same thing. When I posted continual, It considers when there is seat adjustment, handlebar height, angle, etc. It can change from season to season or even as little as moving the saddle back or forth.