Ask HN: Should I separate blogs from personal website?

Hey there! I have a question. I have a personal website where I try to build a brand of me as a professional in the tech industry. I also write two blogs: one related to tech industry, and another one more about philosophy and approach to life. It's time consuming to optimize all the 3 for good SEO, and organic traffic. It's also hard to maintain 3 different code-bases. I feel it would be easier, if I had all the blogs under the same domain (say my personal brand), and optimize just one website. But I'm afraid that putting it all together, might hurt SEO and the rank I'll get from Google. I also feel that it might hurt the users. What do you think?