How did vanilla, a difficult and expensive to grow spice, become so ubiquitous to be considered a "default" or "bland" flavor?

by MG42Turtle

I guess I should qualify the question by saying vanilla is seen as a "default" and/or "bland" flavor in the U.S., at least. Can't speak for other places.

knoperope

This question has been asked before and answered by /u/BismarkUMD:

Why is vanilla ice cream considered the "default" or "boring" flavor?