Why the diet tracking that wins will look nothing like the one we have

Last week I had an interaction with a founder looking for advice/feedback on the product he was building, that just threw me.

He was building a new diet/food tracking app and the tagline was “The food tracker for food lovers”

I pushed him on its meaning and how with so many existing competitors he could stand out. I literally had no idea what his product did, what it would do for me and why it is better than the current situation.