not everything is so critical that being protected against every possible exploit is the most important thing.
If you are running a game server, doing something "unexpected" for someone who puts in a 200 character name may be preferred to shutting down the game for everyone else.
It also depends on what the worst 'unexpected' think that it could do is. If it's "gain a shell prompt on the server" it's a lot more significant than put the wrong thing in a high score list"
You are exibiting the biggest failing of security people, mistaking security as an end in and of itself as opposed to being a tool to support everything else. As a security person myself, it's a tendency that I trip over regularly in myself. Everything has a cost and sometimes the cost of something is higher than the thing it's preventing.
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