[kardos]

If you're not using passphrases on your keys, then yes they are locally wide open, much like a passwords.txt strategy for passwords. If you do passphrase them, the attacker now needs N passphrases. Perhaps you notice the keylogger before all passphrases get logged? There are probably more scenarios where N keys is strictly better than one, but that's the first that comes to mind.

I agree with the privacy aspect, it's that's the same point that the8472 made.

[Dylan16807]

"perhaps you don't use password manager and you notice the keylogger halfway through" is a pretty unlikely scenario to motivate me to use a bunch of unique passphrases.

It's not "strictly better" when it hurts your ability to use and memorize strong passes.

Usability is part of security.