So is it a thing to make sandwiches with no butter or mayo?

I was on a training course yesterday and we were offered lunch.
Just a sandwich and a drink.
By lunch I was pretty famished, anyways to my surprise they added some crisps.

I took a bite of the sandwich and god damn it was soo dry.
I quickly washed it down with my drink.
I checked it and they forgot the butter and mayo.
I had to press the sandwich just to get the tomatoes to create some moisture like wtf!

Is this a thing?