Yeah that's fine but expensive for the tracing problem. You've completely ignored the harder bit which if you have any experience you know is a motherfucker of a problem: what happens if your async request fails, and notifies you, or, fails and forgets to notify you, or succeeds but takes way too long.
What sort of state management schemes do you have to put into place yo make sure your database isn't full of corrupted data that is going to crash you later (or, worse, silently violate an assumed invariant - and maybe black hole your money or your customers money)
The nice thing is that elixir gives you this either automatically or with a line or two of code.
