Why do players still play the old version?

Hello!

From time to time, when I check screenshots section (to hide the ending scenes) I see that some players still play pre-EX version (mostly Chinese players, but not only them).

At first I thought that maybe there was some problems with old saves or something like that. But it's already more than 1 year after EX update and I still see many pre-EX screens.

Do you have any guess?