Sometimes these tangentially-related search results help people discover new things they would've otherwise missed out on. I believe striking a balance between recommendations and to-the-point results is necessary.
Every time I have specifically searched for something on youtube I have found it. But most of the time on youtube I don't actually have something specific in mind. I'm just looking for something interesting or educational and I want suggestions.
I think they have been able to strike a really good balance between the use cases of directed searching and undirected consumption.