Curious to learn more about the arbitrary numbers Satoshi decided to use

I’m increasingly curious to learn whether there’s a rationale behind the numbers.

Did Satoshi explain it in his old posts?

For instance, why:

21M?

8 decimal points?

32 halvings?

210.000 blocks / halving?

Target 1 block / 10 min?

Step-wise 50% decrease of block reward, instead of e.g. linear?

Mining difficulty each 2.016 blocks?

Bitcoin is beautifully simple, yet all those things above seem arbitrary, and the network could probably have worked with any other set of numbers, as long as they’re agreed upon.

Also: did Satoshi envision de profound change in energy markets that Bitcoin would have? Or is this an unexpected consequence of tying energy with the only asset that’s fixed im supply?

Any insights here appreciated