Why is food served on a hot plate at Mexican restaurants?

It seems like nearly every Mexican restaurant I've been to warns you about the "hot plate" when they bring out your food. However, I can't think of any other restaurants that do this. Why is that?

I've seen some variations of this question before, so I want to clarify. I'm not asking for how the plate becomes hot, i.e. "they put it in the oven." Nor am I asking about the purpose of heating it up, such as "it's to melt the cheese" or "it keeps the food warm." I'm asking why it's almost exclusively Mexican restaurants that do this.

Edit: I should also clarify that I'm not looking for examples of other restaurants that do this. I'm sure there are some out there. But in my experience there seems to be a strong correlation with Mexican restaurants. Especially with plates that are hot enough to burn you and not just a little warm.