This is a really simple and definitely a better solution than not using any password manager at all (if we leave out possible government/Google issues, which I

This is a really simple and definitely a better solution than not using any password manager at all (if we leave out possible government/Google issues, which I personally would definitely not leave out). But yeah, as already mentioned - it breaks the privacy and security principles. I would recommend you try anything else, which is actually meant for storing passwords/secrets and when switching, then change all your passwords :)