@ckeen
There is room in the #Fediverse for both single & multi-topic posters. Is that what you mean by "channel"?
I tend to only post on topics listed on my profile page, but sometimes stray onto other subjects (particularly when commenting on posts by others).
I do follow some people who only post on single topics. However, my home timeline still has diversity because I have a wide range of single topic posters. I also follow many people who post on diverse topics.