Not sure I follow fully. I agree with the clean history but what if, as a user, I have multiple Google accounts and I simply login to my other accounts from time to time to check on things? Google "adds" that other account, and the process of removing it is really confusing. I don't recall doing it successfully without logging out first.

This seems to be a very common use case among my friends as well - they all have at least 3 Google accounts out of which they only use one account for chrome linking.