Aside from the lines of code responsible for building the user interface, our program is roughly 48 lines long.
The core of the program resides in the share-price and avg functions, which are responsible for querying the price service and calculating the average of a list of n numbers, respectively. They represent only six lines of code. There is a lot of incidental complexity in this small program.
Incidental complexity is complexity that's caused by code that is not essential to the problem at hand. In this example, we have two sources of such complexity: the thread pool and the rolling buffer function (we are disregarding UI-specific code for this discussion). They add a great deal of cognitive load to someone reading and maintaining the code.
The thread pool is external to our problem. It is only concerned with the semantics...