Rant: Horsepower/muscle car tv shows

okay i've built plenty of motors with my Dad so after watchin HP TV i have some questions:

Why sandblast the rods? I always just cleaned them normally

Why were they cutting the rod caps?

Why grind the corners of the rod caps?

They put the rod and rod caps together and "ground" them where the bearing would go, why?

I always took pistons to the shop and had them pressed on the rod, The guy used heat on both...Is that good, practical or cause severe damage at home?

Now what was he measuring rod bearing clearance for? My dad always mic'd things and called it a day.

I apologize if i sound stupid but i am really curious why on some of this stuff

Thanks everyone, FABO rules!!

Floyd