In my professional opinion

A workplace restaurant can be producing excellent food, meeting its financial targets and delivering against its contractual obligations while employees walk past it to buy lunch elsewhere. There may be nothing particularly wrong with the operation, but if fewer people are choosing to use it, we ought to be interested in understanding why.

At its peak Subway became the largest restaurant chain in North America by number of sites... It's not about the sandwich about the experience

From Wimpy to Deliveroo – And Tea Rooms to Coffee Chains: How have UK Eating & Drinking Habits evolved