Incognito Mode in Google Chrome is meant to be exactly like a regular session, but without your old cookies and with all saved data being deleted afterwards.
This is however not quite true, as websites were able to detect differences in the Filesystem API, which was disabled in Incognito Mode. Many websites used modules which used this difference to block access to those who used Incognito Mode, with the Boston Globe being one example. Many users used Incognito Mode to bypass free article view limits for example.
Chrome 76, currently in Canary, however, fixes this issue by creating a RAM disk which fleetingly stores files, only long enough to fool the site detectors.
Chrome 76 will also block Flash websites by default, will let you install PWAs from the address bar, will let websites automatically enable dark mode and combat pop-ups better.
You can try out the latest version of Chrome by installing the canary build from here.