You said it yourself

STRAWMAN ARGUMENT.

I'm not sure if you have ever taught people how to play Magic, but you don't dive in with teaching the stack and layers. You get the basics down -- the things that are most important to play the game and most important to build the rest of the game off of.

"I see the logic in waiting say, a week or two before laying it on thick as not to scare away new players, but beyond that, why?"

Bolded for emphasis. That.

By far the most important things in any throw are the angle of the disc and wrist snap. It is important that they learn those things before moving on to advanced concepts.

I'm against micromanagement in the very beginning. Where are we for most if not all of our new players? The very beginning. Wrist snap and keeping the disc flat are things that need to be learned independent of your grip or shoulder jerk or hip swivel or whatever.

They won't snap their wrist more by you feeling obligated to say something every time they throw the disc. If you say something everytime they throw it it makes them feel like they aren't making progress. Your teacher in Kindergarden didn't say something everytime you made a stroke while learning your letters. Some things just take practice. Do not feel obligated to say something all the time. It is overwhelming and feels like you are being nitpicked when you get commented on so much.

It is tougher to keep the disc flat when you are getting your arm involved. Once they can keep it flat, however, I'm all for introducing the rest of the body into it. But if they can't keep it flat then trying to make them move more parts of their body to throw is just going to slow things down.

You can teach good form while still eliminating variables like keeping your arm in. In most short throws you don't use much of your body anyway.

It isn't an issue of waiting around for them to develop a forehand. Noobs can't really do much in practice without a forehand, so just set 1 teacher per 2 n00bs aside and have them throw for 20-30 minutes. And if they aren't throwing outside of practice they aren't going to be good enough for me to care anyway. Practice alone is not enough to hone your throwing.

There must have been a misunderstanding somewhere, but I agree that after a week or two it is essential to teach real throwing form. Let them get a basic forehand down anyway they can, and then teach proper form.

And yes, I would teach someone backhand that way if they were really struggling.