And this is still not our problem: in French, spaces must be displayed before ";", ":", "!", etc., period. If iOS or other platforms don't display thin spaces, go talk to them, but don't use thin spaces as long as the result is that spaces are no displayed for readers. Please.
Is this a joke?
You're the one using bad faith arguments by pretending seeing an imaginary space, when my screenshots clearly demonstrate the opposite.
Here's a comparison with the thin space (top) and without any space (bottom), can you now tell me where do you see a difference? (protip: there's none)