Nowadays one Google Account is powerful enough to handle all the internet services such as Search, Gmail, Drive, Photos, Maps, Youtube, Google ONE, Contacts, etc. We often need to sign in with different Google Account to even use the third-party services. You can use multiple Google services simultaneously from different accounts in the Same Chrome browser.
Google has very well implemented the feature to use multiple accounts on one Computer but totally ignored users to let sign out of one account at a time.