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I don't own any SC figures yet and can't say what validity the claim about intetional breakage has, but the idea of creating intentional crack points is sometimes legit.
Pic related is an induced crack for retracting concrete. It's a different field and circumstances, I know. Just saying that it may be legit that instead of making a full slit on the socket to allow it to open they induced/predicted a crack so that the socket breaks the exact amount it needs to, or something.
I fear we can only hear the owners say whether the joints work or not, and either believe them or not.