ON PERSONALIZATION: I'm so conditioned into not allowing non-algorithmic recommendations (i.e., from friends) to reshape my taste profile that I watch YouTube & TikTok videos sent to me only on the web & in Incognito Mode so they won't influence my recommender's suggestions.

At scale - especially with the volume of stuff that I get everyday from actual people - it has a noticeable effect. it basically negates the benefit of true personalization, because what my friends send me is interesting to THEM, not necessarily ME.