> The whole point of vegetarian burgers is so people following those diets can fit into social settings where others are eating burgers.

I do not think so. I eat meat, but does not go for burgers in general. I have yet to encounter social situation in which me not eating burger would in any way be an issue. It just does not happen, never. Being vegetarian poses social issues I think, but you never need a burger specifically.

It is more that people including vegetarians (excluding me I guess) like burger form and like the bun taste.