There’s been plenty of discussion on this topic in Blaugust over the years. People differ in whether they think it’s better to have everything in one place or to split it off into special interest blogs. I think it depends on a couple of things with the most important obviously being what you as the blogger prefers. These are personal blogs for the most part, after all, and ought to reflect the wishes of the creator.
The second big factor, though, is whether you believe your readers come here because they like to read your writing and/or hear about what you’re up to, or whether you believe they come mostly for information. If it’s the former, it doesn’t make as much sense to make them go to three different sites because they’re going to want to read everything you post bcause you posted it.
I’m always toying with splitting my content up. I’ve wanted to do a music blog for years, for example. There are countless music blogs, though, and I feel it’s unlikely a new one would gain any traction, whereas if I include music posts in the blog I already have, some of the established readership will at least glance at them, while eveyone else can just skip those posts. It’s what I do on lots of blogs myself – if people post about a topic that interests me I’ll read it but if they are talking about some hobby I don’t have any interest in, I’ll pass on that post. I still want to be able to have that choice, though, so on balance I think keeping it all in one place is preferable for the regular reader, even if it isn’t much use for the person arriving from Google search.
I’ve added your new blog to both my Feedly along with the other two and also to my blog roll. Good luck with it!