You are getting the typical forum response to people who express any dissatisfaction with cache coordinate accuracy. You see, the majority of people here don't understand much about GPS accuracy, so when you give an example of bad coords, they can always find a situation in which the accuracy would be worse than your example. Doesn't matter whether their scenario applies to your example or not; they reason that if there is ever a reason for a GPS to get bad accuracy, it must always have bad accuracy.
And don't expect people to read your posts. That's way too much trouble for the majority here. If you can't say it in a sentence or two, nobody will read it. For example, I would expect almost nobody to have gotten this far into this response!
I understand exactly what you are saying. I think hiders should take pride in the accuracy of their coordinates, and I recommend averaging multiple readings to do so. Unfortunately, accuracy doesn't seem to be valued much any more; many hiders intentionally post bad coordinates to make their hides "harder."
I wish I had some idea of how to address the problem.
Well if it makes you feel better the few that I have hidden I have tracked down over several different days to make sure that cords are as close as possible.