Here in the Tessitura Community, List Builder is the tool that really helps us flexibly defining populations.
I notice that a number of the recent posts on this forum are about selecting populations.
I would guess that most of the folks listening to this forum think deeply about the populations they want to analyze, contact, report on...
Have you ever run into problems convincing your colleagues you are working with that being specific about the definition of a population is important. (I know that I have from time to time.) You might find this article interesting.
Populations — You’re doing it wrong: Why lawyers might be better than you at statistics