Python async feels great ergonomically at first. Async tasks, timers, things happening concurrently. But then you lose stack traces. Code that starts sync, then appends jobs to an async event queue can't be traced, because the exception happened in the loop and doesn't bubble up to sync (or it didn't back in 3.8). That, among with synchronization problems (it is an event loop, why do we even need to synchronize? async mutex??)

I really tried to make it work, but eventually gave up and went back to deque. Now life is great.