[m12k]

> I looked pretty hard a couple of years ago and couldn't find any explanation of the most familiar QM phenomena like the double slit experiment

I was following links from the OP, and while reading his Wolfram Physics one year update[1] I came across this:

https://www.wolframphysics.org/bulletins/2020/08/a-short-not...

[1] https://writings.stephenwolfram.com/2021/04/the-wolfram-phys...

[throwaway81523]

Thanks, that helps, I haven't made sense of it yet but at least it shows that the issue isn't being ignored.