TypeScript is so syntax heavy. But my perspective is that there are costs incurred at time of development and maintenance in return for stability at runtime. And I think the latter is far more important if you're writing production code.

When it comes to experimentation, I love Javascript and Python because of how fast they are to write when you're not thinking hard about types.

Then it's just discipline to know how to promote experiments to production code. TypeScript is beautiful because you can just turn it on and add them in. Same with Python type hints.