>- Which counties you're talking about?

Pick any you like, Income/GDP is more important metric rather than which specific country.

>- Why are those countries important to think about in this case?

Why are you asking me? Ask the people who brought up third world countries as the target user base for phones with display output. I'm the one not agreeing with this point since it's stupid.

>- Why doesn't this feature help people from regions that can afford a mid-to-top range smartphone?

I explained already below in detail why. But to reiterate in short, if your monthly income is in the ~200$ a month ballpark, you're not gonna be spending 300$ on a mid-to-top range smartphone just for the display output feature even if you managed to save up that money. Even in Europe some people skoff at paying 300 Euros for a phone but some here think people in nations with 10x less income are somehow the userbase for this feature because in their mind those people can't afford a 20$ dumpster PC, but somehow they can afford a 300$ pixel 8 and external monitor.

I have some friends in Argentina where even just a few USD goes a long way. I occasionally throw them something like $10 USD and that gets them GPU, disk upgrades, etc., it's nuts.