Agreed. It is curious how the agent got nudged to add auth in that one.

I did another ad-hoc but this time I added "Use guest auth" to the prompt. This way you don't need to enter an email. Full prompt below

Create a habit tracking app where users can create habits, mark daily completions, and visualize streaks. Include features for setting habit frequency (daily/weekly), viewing completion calendars, and tracking overall progress percentages. Use guest auth

Aesthetic version: https://with-aes-guest-auth.vercel.app/

Non-aesthetic version: https://wo-aes-guest-auth.vercel.app/

I'd give the edge to the aesthetic one.