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It's only some of the >=11 speed ones that advertised as not reusable. And even then not all manufacturers.
The ridges of metal that hold the pins are pretty tiny. I suspect once worn they'd pop open sideways rather than lengthways. The chain going slack doesn't exert much force.
grams-
I think sram have said not to reuse them since 10speed
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According to: http://www.sram.com/sram/road/technologies/powerlock
"SRAM chain engineers developed PowerLock as a tool free, sure and consistent way to connect our 10 speed chains. While PL does not require special tools for install, the especially tight tolerances of 10 Speed drive trains mandated that each PowerLock is good for a one-time application only."
dancing james
Afaik manufacturers do not encourage splitting and reusing chain links. The links aren’t intended for multiple openings and closings and the snapping into position gets weaker. When pedalling the chain is in tension helping to pull the link shut, but offroad the chain is slack more often possibly enabling the link to open up unexpectedly.
Is the manufacturer guidance overkill?