That's because people are using crap coatings like McKees and CQuarts OTC stuff. CQuarts Finest is different,
The only thing AG offer that is any good is Gyeon and they just started caring it. AG only really tries to push the box store stuff you can buy anywhere. All the AG private brands are just knock off's of other products. All the Wolfgang, KcKee's, Pinnacle * Including Black label and Black Fire stuff is really not that good but people buy it because they think it's special. It's not special at all.
Sonax Paint Sealant can not touch a true ceramic coating like Gyeon MOHS or anything by Kamikaze. If you think it can you are being sold a line of garbage by a marketing team and fooling yourself. I live 45 min east of Philly PA and we have Salt, Brine and everything on our roads. Wax or sealant of any type is a joke.
You would be better off buying from real manufactures like Dodo Juice, Bouncers, Sonax, Gyeon and other not sold on AG. AG is not the end all auto detailing authority.
Do you have evidence, like clinical trials / comparisons / tests to support your claims? Personally I read the tests, reviews, comparisons from folks here who are experienced and actually test things. Their results are contrarian to yours, and they support their findings with evidence.