@robertlie, you could make that recommendation. We all have our own “rules of thumb” and I prefer VSWR to be < 1.5.
A far more important message is “BEWARE many antennae do not work as advertised” For example I have a 915MHz antenna which is tuned to 868MHz. It sort of works in the 915MHz band but has severely limited the performance of my nodes. Knowing a lot of antennae are not as advertised I purchased from a reputable supplier and still got caught.
Therefore to have some idea of what you are buying, information sites like “The big Antenna S11 catalog ” are an important reference. Otherwise check with the supplier for the antenna’s data sheets / performance graphs.