> Seems like it would be better just convincing everyone to use the English versions of everything since those are perfect and the majority of the world knows it now.
There are lots of e.g. elderly and less educated people in non-English speaking countries who don't speak or understand much English, at least not enough to be comfortable. You don't even have to go further than Europe for that. The aging might not be a key target audience for many apps and it might make business sense to not bother with translation, but there's a significant number of people who might be excluded by that, and it would be difficult to accept that as a solution at least for the most commonly needed apps.
It also seems a little presumptuous that English should be pushed as a general solution to everyone in the first place, but you don't even have to go there before you get into practical problems.
There are lots of e.g. elderly and less educated people in non-English speaking countries who don't speak or understand much English, at least not enough to be comfortable. You don't even have to go further than Europe for that. The aging might not be a key target audience for many apps and it might make business sense to not bother with translation, but there's a significant number of people who might be excluded by that, and it would be difficult to accept that as a solution at least for the most commonly needed apps.
It also seems a little presumptuous that English should be pushed as a general solution to everyone in the first place, but you don't even have to go there before you get into practical problems.