I'd say that the idea of a thread pool can be abandoned if it is not
useful, and it seems that it would not be useful.
And don't forget to put in comments or other documentation
explaining why this decision was made, so that future
developers (a) won't spend time putting it in (or asking
why it's not in), and (b) will understand why that decision
was made, in case things change (e.g. thread creation
turns out to be expensive under some new, unforseen
circumstance).