JavaScript keyup event, is event.key.length === 1 enough to check that character is printable?

I see examples where people, in order to check if e.key is a printable character, check key.length (where 1 means a printable char). Other people also check for !e.ctrlKey && !e.metaKey && !e.altKey (modifier key).

For what I can see doing some tests, only the first is required. So, Is the second check just excessive zeal?

document.addEventListener('keyup', (e) => {
    const isPrintableChar = e.key.length === 1;
    const noModifier = !e.ctrlKey && !e.metaKey && !e.altKey;

    // Just check the length
    if (isPrintableChar) {
        console.log('printable');
    }

    // Check both length and if it's a modifier
    if (isPrintableChar && noModifier) {
        console.log('printable+');
    }
});