I just don't get how Youtube recommendations are so bad. So often it recommends me things I have already watched. Or the algorithm knows I like David Bowie so

I just don't get how Youtube recommendations are so bad. So often it recommends me things I have already watched. Or the algorithm knows I like David Bowie so recommends me "Changes". The most boring possible recommendation it can give to a David Bowie fan. I really wish it had a setting to up the daring of the recommendation. It seems designed to just never recommend something that I would really hate but in doing so it never recommends me anything all that interesting.