Which limits cleanup after cancellation to be synchronous, doesn't it? I often use asynchronous cleanup logic in Python (which is the whole premise of `async with`).
Sync Rust is lovely, especially with a bit of practice, and doubly so if you already care about how things are stored in memory. (And caring how things are stored is how you get speed.)
Async Rust is manageable. There's more learning curve, and you're more likely to hit an odd corner case where you need to pair for 30 minutes with the team's Rust expert.
The majority of recent Rust networking libraries are async, which is usually OK. Especially if you tend to keep your code simple anyway. But there are edge cases where it really helps to have access to Rust experience—we hit one yesterday working on some HTTP retry code, where we needed to be careful how we passed values into an async retriable block.