I mostly agree on this - my extension to #3 is that estimates are fine as long as when you inevitably sometimes miss your estimate, you're not held to the fire for not being a fortune teller and asked why you didn't get it done last month.

I'm also not sure I agree on your take on Sprints. In my mind, the value of sprints is that they provide a barrier where you should be able to go "we already loaded all our work for the next 2 weeks. If you want something done, we'll start it in N days." Done right, sprints are your defense against "can't we just do this thing".