> I do clear cookies and history periodically, so perhaps not having a multiple year history counts against. In that other link I posted YT suggests pruning yo

> I do clear cookies and history periodically, so perhaps not having a multiple year history counts against. In that other link I posted YT suggests pruning your watched history to get better recommendations -- but that's a huge undertaking given the thousands of garbage videos that I've clicked out of in five seconds. Seems like it would be better if the algorithm only operated on data from videos a user manually "likes".