This is only true if you don't get your weight forward and getting weight forward is important. If you do get your weight forward starting your pull lower will help get the nose down. Think of it this way, with your weight back you'll be forcing the nose of the disc upward (nose up); with your weight forward you'll be forcing the back of the disc upward (nose down).
100% agreed.
I'm not sure the wording is right (I don't like the use of the word "speed") but I think what you're trying to say is correct. Focusing on accelerating
late is improtant. You want to be moving faster after the disc leaves your hand than before. How fast you're moving at the hit isn't nearly as important as how much you're accelerating. This is what the "right pec" drill from the Dan Beto video is trying to get across, too. I disagree with using a Beast for it, though.
I don't visit those types of bars often enough to relate.
Again, I think the point is late acceleration, which is really important. Slap through their face, don't just slap at their face.
By definition, three steps is an x-step. Using the Dan Beto video to build it from the hit back is by far the easiest way to build one correctly.
I'm not sure I understand what you're saying. Are you saying to keep the disc foward, pointing at the target during the x-step? That would make the x-step useless. Are you saying not to start your pull until after you plant your pivot foot? That's absolutely correct. Starting your pull before or when you plant your pivot foot will probably lead to grip lock.
100% agreement here, too. This is what I mean when I say "weight forward."
I'm not sure what you mean about stopping the hand, but I think the thumbnail part might be talking about not rolling your wrist, which is important to be able to control. I agree about when the pivot happens, too.
Again, acceleration is more important than speed, but saying it should be late is correct. If you only focus on speed then you could reach peak speed before the hit and maintain it through the hit and still do what you're suggesting. That won't lead to snap and will limit how far you throw. Reaching peak acceleration at the hit will generate a ton more power even if the speed is lower.