Well, after my business trip concluded, there were at least 8 virtuals I went to, dutifully copied down information from the item of interest there, only to find out that I was supposed to: "take the last digit from the date and calculate yyy" or "after getting the person's name, go to Nyy zz.xxxx etc".
There were also several supposed traditional caches where I went to the site, looked around for an hour or so and couldn't find the treasure, only to find out that "the above coordinates are bogus". I notified the respective cache owners in these cases that their cache should be categorized as a puzzle or multi-, but after a month, the caches remain miscategorized.
No matter what, adding new categories of caches won't make people categorize their caches properly - GIGO. But, for multi-stage virtuals and puzzle virtuals, if someone has the ability to categorize a cache properly, the PQ would filter them out correctly.
Thanks for your consideration.