Karl_in_Calif once bubbled...
Corn-Fed if you promise to stop following me around like a little kid, ok then, I will answer your question.
Before you were born in 1978, back in the late 60s and early 70s, scuba was first an extension of freediving. Thereafter it became an extension of Navy diving. Back then, when scuba was taught, it was taught either by a local county lifeguard or else by an X-Navy diver. This instructor taught you to his level. You became a lifeguard or a Navy diver. This meant you became a freediver, first. Then you learned the scuba. And then you learned decompression protocols in your basic open water course. You computed Navy repetitive groups and Navy decompression dives to 200 or more feet.
There were no B/Cs in those days, unless you count the Navy horsecollar, which was mostly a surface flotation device. Therefore you could not overweight yourself, and you needed a grasp of how to set your natural buoyancy neutral.
Guess where the only place today is where you can still learn all of that?
Answer: in technical diving.
So after you finish your OW course, then AOW, then basic nitrox, and rescue, and divemaster, and instructor, and advanced nitrox, staged deco, advanced air, and then trimix, plus whatever else interests you, like ice diving, cave diving, or shipwrecks ...
Then, you will have learned things the way thing were taught originally. When an open water course taught you everything. And when an instructor course made and instructor into a technical instructor as well.
The cave divers and the ice divers and the shipwreck divers of today do that well. And their instructors are instructors' instructors.
Thats why.
Did you learn that in your NAUI ITC?