Advice please: multiple blogs or single

Let’s see if I can put this succinctly:
I’m trying to find the most efficient way to put together a complicated (to me) blogging set-up. I have varied interests (eg music, writing, athletics) and I want to write about all of them. I notice in my own reading that I do not read generalist blogs. Instead, I prefer they focus on one topic. So I had been planning on creating a different blog for each of my interests, hosted in subdomains of my main domain. That way people could subscribe to feeds w/ high signal/low noise according to their interests.

However, I’d like to have the overall homepage be a page with some sticky text and the latest post from each blog. (Can this be done?)

My question: Would it make more sense to install one WP blog, make the subdomain pages generate based on individual categories (and have distinct category feeds), and then have the overall homepage list most recent posts in each category rather than from distinct blogs?

Apologies if this is longwinded or makes little sense.