Agree with everything you posted.
I would like to add water sources would be contaminated in short order. There will be no sanitary treatment and river sources downstream of the first city will be contaminated.
Everything is electricity. Electronic funds, communications, transportation and the list is longer than most can imagine in their normalcy biased cocoon.
The United States and Russia have each set off "
ONCE" at scattering altitude nuclear weapons. The
Compton Effect was very real and deleterious far away. There are good reasons why we didn't do it again.
For those that denounce the 90% figure, I see as hubris and a lack of imagination. Both normalcy and confirmation bias will result in the death of even the most "enlightened keyboard warriors."
Unless the grid is hardened and key transformers are already on site (protected), I don't see the grid coming back up.
Thought I read somewhere that we don't have some of the gear needed to recover at all. I could be uh, incorrect. (That's what I get for "thinking")🤔🍿🍻🚬🗑