The trouble of varying your content

[Andrewcu]

If I had a cooking channel and then posted a pet video, the pet video probably wouldn't do well.

This is because the cooking subscribers will generally avoid or watch little of it, thereby giving it bad stats and so YouTube wouldn't promote it widely. Even though the pet video might be thoroughly enjoyed by pet lovers!

So the workaround is create multiple channels which is a pain.

The other way is to be a big enough YouTuber that you'll have enough subscribers with cross over interests. Or to make your channel more about your personality than your topics. Not easy workarounds!

What are your thoughts on this?

 

[Graphic Designer]

Absolutely right! Not only will the subs only enjoy one type of niche, but having two or more niche will confuse the YT algorithm, and it will not optimize the video rankings. But two channel would be a major strain on time. So after a while, pick the one that is more successful and completely drop the other one and maybe pick it up later.