I feel you. I write mostly Java code, but I've worked heavily with python + qiskit for quantum ML the past 3 months, and it's excellent. Qiskit is "low" level enough to give me the freedom I want, and with Jupyter Notebooks it's just so much easier to quickly construct something and evaluate, as well as extract it in a way I can put it in a paper.

C# and Java feels exactly the same to me now that Java has lambda/stream collection methods to match LINQ. Not sure how you feel there is any difference between the two. The only difficulty I have is when I have to work with Java Frameworks, even though I "never" use Java until I have to jump into a specific feature for other teams.

I never said there is a difference? I'm talking about Java <-> Python/qiskit/jupyter. Its a very different way of doing things, but just as enjoyable, and I'd say it's the currently best solution for any r&d and prototyping