I think this is fair criticism. I am coming for theoretical physics, where, at least in my area, I see my proposed strategy actually being practiced quite often

I think this is fair criticism. I am coming for theoretical physics, where, at least in my area, I see my proposed strategy actually being practiced quite often. Physicists are quite a lot less grouchy than mathematicians, and there is a lot less of your point 1 in Physics. That said, to present in "high impact" journals, you do have to write your results in some grand fashion where it is the greatest thing since sliced bread. But the results, not the proofs. Then again, the difficult theorem proving papers are rarely published in high impact journals. Also, I have seen quite a number of papers where the arxiv submission is more updated/expanded than the published version. If you have some new framework that you want people to adopt, then it is in your benefit that grad students actually understand the ins and outs of it, so people so inclined do put in some effort to make their results accessible.