they all do to a certain extent. It's why i prefer wood. it's organic, every stock has a different grain, they seem "warm" to the touch compared to polymer/other material. *
Is wood weaker than other stock materials? maybe, but if i manage outright break a sound wood stock by falling or some other accident I doubt I'll care much because I'll probably be broken too.
*if the wood is good and finished right. some companies look like they pick out of the sawmill reject pile and others ruin the looks of a perfectly good stock by dipping it in hideous varnish (Uberti).
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(Merkel model 8 anson & deeley patent boxlock w/ scroll back action and engravings)