A couple of other examples of "the old ways are still good:"

I have an old touch-tone phone in the house. I wonder how many people realize that when the power goes out, so does that nice wireless station in the kitchen. Some have backup batteries, but in my long experience of power outages, the power will usually still be flowing in the phone system if you plug in a non-electronic phone.

I have no idea how reliable cell phones are in widespread power outages. I assume critical systems have power backups, but who knows?

For sure, everybody and their cat will be jamming the circuits.

I have a manual typewriter. Okay, not essential for survival, but when the EMP hits, I'll still be writing books. Very laboriously. I do NOT miss manual typing.