The weakness of the strong Sapir-Whorf hypothesis is that it is simply too strong. There is a host of evidence beginning in the mid-late 20th century demonstrating that at most, the language a person speaks merely influences how they view the world. Linguistic determinism also presumes that language is the only factor governing a person's cognition and perception, and this is false, too.
Finally, if each language has its own distinct worldview, as the strong Sapir-Whorf hypothesis states, then it should be extremely difficult to translate, or at least convey, concepts from one language to another or to learn a second language--but this isn't the case at all.
In short, there is a reason that the strong Sapir-Whorf hypothesis is no longer prevalent in linguistic inquiry. Its claims are too strong and lack nuance, and as a result, it has been largely disproved by subsequent research.