OAuth tokens used in automation tools will continue to work. Entering in username & password through auth, to automate an OAuth flow (or any other traditionally manual flow) will stop working. Breaks some puppeteer scripts too - but those have been getting flaky for a while now.
Yes I would agree with that, except that if you change a password you know the scripts will fail, but if an OAuth token gets invalidated by the system and not you, then it will fail without warning.