Point is you can use passphrases that are easier for humans to remember, but you then need to measure entropy as numbers of words and size of dictionary and 16 characters is too little. https://xkcd.com/936/
Yep exactly that. It would be great if I could just use some whole words as the password for accounts which I need to use often or are really important and thus IMHO make password stores impractical (e.g. desktop login, Gmail, …)
Add second factor authorization for these, in any case. Google Authenticator app on the phone works reasonably well, or perhaps even get a physical token.
I use a passphrase on my Gmail account in the manner of "This is the password I am using for Gmail". Works just fine.
Pass phrases can be a problem because they are attacked using dictionaries just like words are. Choose carefully.