In 1 and 2, you appear to be trying to instil technique which, as yet, has no actual function
I don't know how much teaching experience you have, but
it seems like you believe that learning to play with curved fingers is not important from the very beginning, and can be learned later.
I have suffered from tension and even injury caused by overcurling, so I could not agree more about what's already said. Due to my handshape I cannot really play with "hold a ball" shape hand and when I was taught that it ended up bad. I have had to accept that my playing doesn't look pretty that way For some people it takes time to find the balance inside and the right idea of how something should feel, it doesn't help much to just tell them to make their body look a certain way.
Otherwise, you are trying to teach movements that do not make sense to the pupil and that sets a bad precedent.
I have done a LOT of reading about teaching beginners, and one of the biggest issues that I have seen mentioned is a failure to teach proper technique, including playing with proper hand position.