In the past and even now there was this practice of writing focused content on a particular account / blog, because that's what your followers want to read... Maybe, to a degree, it can be true.
On the other hand, an author can experiment, can try out different topics and express their interest in different domains. Plus the human, life side, which some show, others don't, and the degree varies from person to person.
I believe the second approach makes an account more interesting than a monotonous content, as interesting or useful as it may be.
I also don't like monotonous contents and the idea of writing for an audience is not completely something I like too. Writing for an audience comes off an Money-oriented and this isn't something that should be severely done.
I have experimented over the years and to be honest it's be best way to find the perfect blend, if there's something like that.
I don't think a follower wants to read the same type of content, most consumer just wants something good