How complex and demanding do you expect "personalize what I want to see" to be? I remember when i used facebook how I hated when they removed the chronological

How complex and demanding do you expect "personalize what I want to see" to be? I remember when i used facebook how I hated when they removed the chronological timeline showing everything Im following. Personally all these "personalization" features are anti features to me. I always though they need this fuzziness to charge for placement of ads and adlike stuff