This is why you need to read through the detailing forum on here. This is not always true.
I for instance do not like Zaino.
It has always been true in the experience of myself and many others, even if some people feel otherwise :P
There's a decent list of factual scientific reasons Zaino > Wax from a longevity and protectorant perspective as well... from an aesthetic perspective it's more an opinion thing
Zaino generally beats NXT in the testing I've seen as well FWIW
I'm not going to get into a Zaino argument, but people who push Zaino have a tendancy to dismiss people who don't believe its the best thing ever invented as not knowing what they're talking about. Thats not true, many people don't care for Zaino. I used it for years and while its a good product and is very long lasting I don't like the look on dark cars, and I don't like the fact that you can't use products with blemish-hiding properties underneath it, and if you wash and wax your vehicle regularly the longevity isn't really much of an issue.
Zaino's good, but there are a lot of other products out there which are good as well.