I'll cop shit for this, but The Bear.
Observe that people want beef subs, that beef subs are good, and what needs to improve is the restaurant management and staff stability. You can still innovate with sandwiches and pastries, you don't need to convert to a fancy restaurant and charge stupid prices for a different daily menu.
What they did in The Bear by converting to a fancy restaurant and alienating their customers was the most boneheaded business move one could possibly conceive of and I despise Lip for squandering mikeys money like that.