Most of markets segments I can think of (pharmaceutical, automotive, SAAS) do it in one way (direct price discrimination) or another (separate products for a region).
Just about any commodity would qualify. Oil companies aren’t giving discounts to poorer countries or selling them a cheaper inferior product.
Lots of indie software makers can’t be bothered to put in the effort to target individual countries, and just sell at one price worldwide. I believe both Apple’s and Google’s app stores work this way, with no ability to set a different price in different countries.
Google play supports setting different prices by country.
I’m saying, the fact that they don’t proves that it’s not necessary.
These two statements are perfectly compatible with each other.
Again: I’m not arguing for or against price discrimination. I’m just saying it’s not a need.