In that case, you'd understand the difficulties of providing a product or piece of software out of the box with valid certificates without user setup, as you've done (without running all user data through offsite servers).

I too have a working reverse proxy setup or few. I certainly don't expect something using a "localhost site" to come with valid certificates. Unless they somehow get a valid cert for https://localhost

Edit: apologies for the assumption, I didn't realise that you weren't the guy I originally replied to. I'm new around here.