> Often this will be combined with fallacious notions such as “remember this device”, the idea being you only have to go through all this the first time when logging in from a particular device. This idea is fallacious because the web has no notion of a “device”, and this is a very intentional design choice made for privacy purposes. We are literally living through the gradual phase-out of third-party cookies, amongs…
I read OP's mention of third party cookies as an example of browsers supposedly moving in a more privacy focused direction, not as being related to authentication.
This is... sorta true? Insofar as creepy advertisers also "remember this device". But a first-party site storing a cookie to remember a login session is not at all in the same category for me.