Reconsider disallowing heredoc and nowdoc

[westonruter]

Per #792 (comment):

I'm curious about the rationale here. I can understand the issue with HEREDOC since you can't add escaping functions in the output for interpolated variables, but this isn't the case for NOWDOC.

For example, in WordPress/performance#2144, I want to do this:

$js = <<<'JS'
	const authRadios = /** @type {NodeListOf<HTMLInputElement>} */ ( document.querySelectorAll( "input[name='plsr_speculation_rules[authentication]']" ) );
	const noticeDiv = document.getElementById( "plsr-auth-notice" );
	if ( authRadios.length && noticeDiv ) {
		for ( const authRadio of authRadios ) {
			authRadio.addEventListener( "change", () => {
				const isLoggedOut = ( authRadio.value === "logged_out" );
				noticeDiv.classList.toggle( "notice-info", isLoggedOut )
				noticeDiv.classList.toggle( "notice-warning", ! isLoggedOut )
			} );
		}
	}
JS;
wp_print_inline_script_tag( $js, array( 'type' => 'module' ) );

But the PCP ruleset is flagging this. What is the risk here?

Note: There are 52 files in WordPress core using heredoc/nowdoc: https://github.com/search?q=repo%3AWordPress%2Fwordpress-develop+%2F%3C%3C%3C%27%3F%5BA-Z%5D%2B%2F+path%3A*.php&type=code