I've been following this topic for a while and staying out of it, because I don't have a whole lot to add mathematically. It's been very educational to me, though, in multiple ways.
I've learned that there is a such thing as displacement current. I learned how capacitors work in a better way than I did previously. I even learned how inductors work in a better way than I did previously.
And I learned that in every discipline, there's always *someone* who insists on splitting hairs in such a way that newbies will get hopelessly confused if they listen to that person.
Here's the deal, from my perspective. If you want to take electric current and displacement current, add them together, call it current, and suddenly all sorts of equations work and things light up and buzz and doesn't release the magic smoke, then trying to split hairs about it from an electronics perspective really isn't helpful. It may be, in some obscure and very deep field of study, technically correct, but it's utterly useless in the context of getting things to beep, buzz, and release the magic smoke.
I know as a Linux guy, there are a few "traps for young players" too. For example, if someone were to ask me what "tar" does and I were to go into a huge dissertation about tape drives and streaming data and all that... yes, that's what tar originally did (tape archive) but all a hobbyist really wants to know is, how to I turn this .tar file into a directory I can do stuff with? "tar xvf" and move on. Read the man page if you care. But there is absolutely nothing essential about the history of the tape drive and tape archiving, etc., and all it does is confuse the issue.
And there is absolutely nothing essential in this case about knowing where the individual electrons are going. The important thing is "how do I make the circuit with this capacitor in it do what I want?" And the answer is... you think of electrons as flowing through it.
Please, for the sake of beginners and newbies and people like me who have been at it for a while and are only just now learning some of the deeper stuff - don't confuse the issue. It doesn't help.
*gets off my soapbox*
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