The general point behind the proverb boils down to "you can't have it both ways" or "you can't have the best of two worlds". That's essentially what the parent

The general point behind the proverb boils down to "you can't have it both ways" or "you can't have the best of two worlds". That's essentially what the parent comment is trying to do. When offered the Android ecosystem as an alternative, the counterpoint was to lament the lack of Apple Watch and iMessage support in the Android ecosystem. This is textbook "I want it both ways".