Why use green leaf lettuce in a burger?
It's essentially tasteless and has the mouthfeel of wet nori. I think the worst offender might be Shake Shack, which is a travesty because they make an otherwise fine burger.
I could easily do without any greens in my burger but if you are going to adorn some greenery at least use something that serves some purpose.
Something like iceberg at least provides crunch, but green leaf just makes a burger look portrait-perfect and actually detracts from the burger's taste