It's a generalization but not a rule. Typically, "hot" (medically significant)scorps like buthids have thin, elongate "claws" whereas; species from genera such as Anuroctonus, Diplocentrus, Heterometrus, Uroctonus and Pandinus have large, heavy, robust chelae.
It's simply a generalization. Generally, as the members of the family Buthidae are accepted as being the majority of the world's most potentially dangerous scorpion species, it's generally true but by no means, a rule set in stone.
Typically it is wise to assume that a powerful metasoma indicates a more potent venom e.g. Androctonus or Parabuthus sp.
Think about it, naturally if a scorpion has thin, and thus weaker chelae, it will most likely rely on it's venom potency, or even amount of venom injected, to subdue prey. Whereas species with huge and powerful chela, such as members of Pandinus and Heterometrus sp have a much weaker venom and rely on their pincers to capture prey.
An obvious exception to the "rule" is the "Deathstalker" (Leiurus quinquestriatus), as it's common name suggests it is a scorpion with a very potent venom and although it follows the rule in regards to thin chela, it doesn't typically have a noticably powerful cauda or large vesicle, like say, a Parabuthus transvaalicus. Though it is considerably more potent than Parabuthus transvaalicus.
So in that respect, caution is always advised. As somebody mentioned previously, treating ALL buthids with respect is advisable. There is potential with ANY venom to have an adverse reaction, even with the milder variety.
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