No one said or implied any hitch would do anything for a fiver running high hitched or a rig with a light pin would be miraculously cured by an Andersen hitch or anything else. You introduced that comment as I recall. I don't think any hitch can make up for those issues and didn't see any comment suggesting it would. It may be true wording in a post lacks precision, but this is a discussion, not a paper submitted for peer review in Science magazine.
It is also extremely difficult for me to assume that with well in excess of 100 favorable reviews and multiple comments regarding a reduction or negation of chucking all those owners are newbies. Many of them contrast the improvement with hitches they have owned in the past and named the hitch they previously owned.
Is there a "halo effect" as suggested earlier with what one finds on manufacturers' sites? I agree a good many folks are enamored by their purchase and suddenly everything is sunny. Even given this, however, it is still difficult to make a case that everyone responding on this forum and everyone reporting in other forums or websites is so smitten they are blinded by their new hitch.
As I noted previously, some owners report they still have chucking with their Andersen. I don't think it is perfection, but almost to man, they report improvement to some degree.
Is the data we have predictive of improvement in every case? Certainly not, there are always shades of gray, but that does not negate concluding that there may be some reduction in chucking that varies by rig.
Is there ever enough information in an scientific inquiry, which is what this is? Very seldom, but it is best to not "throw the baby out with the bathwater"
I am not ready to buy one yet, but would like to try one.