I think better developer tools tend to compound over time, they raise expectations and push the whole ecosystem forward.
IMO, uv is quickly becoming one of the best reasons to start a new project in Python. It’s fast, and brings a level of polish and performance that makes Python feel modern again.
I think uv is one of the best examples of why not to start a new project in Python. I mean, depending on the project really, Python has its place. But if your project is anything like uv, uv proves you can't actually write an app like uv in Python. So for as great as uv is, its proximity to Python is a constant reminder of its shortcomings.