One of the challenges I see in general is that languages don't have enough capabilities to express intent of lifetimes / control flow. What I mean by that is that there is a significant difference between spawning a thread with the intention of joining, allocating memory with the intention of only lasting to the end of the request etc. vs spawning a permanent background thread or stashing away an object into a global cache.

This is starting to really become a problem in the observability space and async locals. Node.js for instance currently will keep async locals around for too long of a time because they are propagated everywhere. For instance if you call `console.log` in a promise you will leak an async local forever.

Next.js famously keeps around way too many async locals past the request boundary for caching related reasons.

A solution would be to have a trampoline to call things through that make it explicit that everything happening past that point is supposed to "detach" from the current flow. An allocator or a context local system can then use that information to change behavior.