After years of working with Flexbox, I have realized Flexbox is like plugging in a USB-A: justify and align are always the wrong way around on first try.

But, like USB-A, are they also frequently the wrong way round the second time too?

Yes.

It's because both USB-A and flexbox are in dimension of a higher order

Man, why is it so hard to keep in memory ? Can keep a whole bunch of stuff in memory - including CSS float layout for years, but flexbox hits that strange place where if one doesn't use it for a couple of months, one tends to forget 80% of it and needs to re-read from scratch and spend time on the playground again.

The problem is that too many property names are just non-intuitive or plain wrong. They might as well have given them one or two letter symbolic names.