Speaking of dead threads...

So I was looking at dado blades today (for no good reason), and I came across the concept of "zero clearance inserts" for tables saws. I was curious and it sounded like a good idea, so I did some more googling. Finally came across this website.

Now, this procedure/method generally sounds like a REALLY BAD IDEA(tm) to me, but I was curious what the real woodworkers thought.
I am the Doctor, and THIS... is my SPOON!