Do websites trust “returning behavior” more than perfect fresh sessions?

I’m starting to think being too clean might actually look less normal sometimes.

A lot of setups aim for perfect isolation every session. But real users come back with history, small habits, repeat timings, familiar pages, same rough flow. When every visit looks like a brand new sterile session, does that hurt more than people realize?

Has anyone compared a stable repeat-user pattern vs constantly fresh sessions and seen which one lasts longer?