[djur]

The primary use case for Incognito Mode, as far as I know, is so a user can casually use a browser without leaving inadvertent artifacts of their usage on the machine. Having a page you visited in Incognito Mode be visible in Chrome after Incognito Mode is closed seems to be precisely the kind of thing users expect the feature to prevent.

[cookiecaper]

If you associate the Chrome browser with your Google account (not just logging in to a Google site, but going to settings and putting the information in there), the history will be synced across several devices. Incognito can be used to prevent pages viewed on your phone or laptop from going to your desktop's history or vice-versa.