ABYC will never say anything is "safe." There are ways to reduce risk but no boat will ever be "safe."
"... have you ever seen a seacock fail due to impact?"
Nope, all the boats I have owned or worked on have seacocks that are protected from that kind of abuse.
If you want to reduce the risk of breaking a seacock, protect it from falling objects and from becoming a stepping stone either intentionally or otherwise.
You can install a short piece of hose between the through-hull and valve and all but eliminate any chance of placing a bending load on it if you want. Cover the entire assembly with a box if you like but don't go around telling people that there is only one way to do something. Even ABYC acknowledges that fact.
If you are worried about de-zincification then check your fittings more often, know what you've got, and learn to recognize conditions before they become problems or worse.
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