I think the idea of posting corrected coords is fine. In my area that is the norm. I can remember a cache, "Woodmen of the world" that I visited 3 times to get to that log. Huge power lines created a "mirror" for the signal,, and the coords were pretty far off. Some cachers will travel 100 miles to log a cache, and that has to be taken into consideration. I always average my coords for at least 3 minutes,, and if they are off, I appreciate the help.
Now,, as to the posting of links to spoilers. I have placed only 7 caches. Of the 7 ,, six are puzzles. I would ask the poster to remove the link on my puzzle caches. If they did not comply, I would delete it myself.
Also,, I am working on a monster multi-puzzle cache to be placed soon. On a puzzle cache that I put that much thought and time into, the post would be deleted as fast as my fingers can type. Not everyone has the willpower required to not look at a spoiler. An extra special cache is a creation. That creation would be altered by a "give away" spoiler.