I disagree. What is expressed is an attempt to solve X by making something that should maybe be agnostic of time asynchronous. The problem is related to design: time taints code. You have a choice: either you make the surface area of async code grow and grow or you treat it as impure code and you lift pure synchronous logic in an async context. Without more information on the surrounding algorithm, we don't know if the design decision to make SymbolTable async was the best decision and we can't propose an alternative. This question was handled superficially and carelessly by the community.

I'm not sure I understand the problem, everything you are describing is already possible.