Because until relatively recently WordPress supported PHP 5.2+, but that constant was only added in PHP 5.4.
Given that wp_json_encode is meant to encapsulate and account for the differing behaviour of json_encode across multiple PHP versions, it doesn’t make sense to deliberatly change its behaviour for PHP 5.4+
Now that WordPress has raised its minimum PHP version, you should consider opening a Trac ticket with a patch to add the constant with the reasons why it would be an improvement and testing instructions
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