Not every await and new task produces an allocation in C#: ValueTask only allocates a state machine box if it yields asynchronously, plain task objects are pooled for common values and state machine box itself can also be pooled for frequently called methods (is opt-in), for example socket.SendAsync does not allocate thanks to this.

This will change further as "Runtime Handled Tasks" implementation comes along which will replace Roslyn-generated explicit state-machine code with runtime-provided suspension mechanism which will only yield/suspend the execution at true yield points, with further improvements to how the captured state that needs to persist across them is stored.