The right tool for a given problem is usually much more ergonomic and productive. To me purism of language or tooling is a disservice to an engineer’s instinct of solving a problem. Use Python where it is a strong option. Use Spring Boot where it makes sense.

BTW, I’m also on a similar trajectory using a mix of Java, Python and Node.js to solve different problems. It has been very pleasant experience compared to if I had been bullish on just one of these languages and platforms.