OP: I agree with the idea that a nuke won't fly the way it is intended to fly until you can rip on it 400'+ but at the same time I never didn't use a nuke. I also never disced down, and I'm a 450'+ thrower (depending on wind)...
So yes when an esp nuke is ripped it will flip and turn a great deal and then come back for you... but at the same time you don't have to stop using it. Just know it won't go any further then your slower discs. So if it works great in head winds... USE IT! If it doesn't turn but goes straight... then awesome... that's the point of disc golf, getting discs to go straight to where you want them to go. I have had my rear end handed to me from guys throwing nukes, bosses, and other crazy discs only 300' but then place them at the basket, they know how to manipulate them, and they win!
The point of discing down is to get used to how a disc "should react" which again, is relative to what "should" means. Because for me, I need a beefy cake force to hyzer in a headwind... you might need a nuke. Either way, the point is the shot and making it to the basket... So yes learn, but enjoy the game! use what discs you like!