Comment by kllrnohj

Your photos rarely if ever match the size they are displayed at anyway. What Apple does is the worst possible thing for your photos, which typically end up double resized (once to the app's internal size, then once again for the display scaling).

The largest platform, Android, is not pixel based. The largest desktop platform, Windows, also went through the effort to try and do things properly here, letting the app handle DPI instead and then providing updated toolkits to do that automatically.