Craft the Perfect Table WITHOUT Breadboard Ends! | Amazing Mitered Wrap Around Border Trick

So, I'm curious how do those mitered hold up with the expansion across the table? It doesn't seem like expansion was actually accounted for. The point of of the bread board end is to allow expansion/contraction of across the width of the table. I only ask, because I want to do something similar.

Why not use a sacrificial board instead of going through all that?

Cool table!!!