You may recall that Google was all in a lather last year that access by 3rd party apps to gmail had to be via OAUTH2 or by using app-specific passwords? I wasn't going to go to the bother of adding OAUTH2 support to my email client but discovered that by having them generate an app-specific password I could just use that in my client as the account password.
What the buggers didn't mention is that changing your general google password will invalidate your app-specific password. And they made it a lot harder to find the place to generate another one.