Its pretty obvious that the link I provided earlier has not been read, thats ok...
One thing realize is a pizza steel will never ever crack...and beside the fact that you can use it as a grill/griddle.... It also like a stone add thermal mass to your stove..
This site pretty much uses Scientific Method when they develop recipes, and reviews..
It is a worthwhile read
Baking Steel Delivers
I have one nice baking steel...two stones that havent cracke yet