I will post a series on this too, just to illustrate the words, which may hit the spot and may not.
The reason you'd want to disassemble a pinning may be simple curiosity ( on what planet ? ) or because you must. I'd guess that sooner or later you'd stumble on a situation where you must.
Duplicating quickly comes to mind, whether for underwear or for mulitple covers out of the decorator fabric.
I haven't really thought about it but for about five minutes, but maybe thinking longer wouldn't change my opionion......I don't know that even I could disassemble a cover that was pinned on the right side of the cloth, with the seam allowances turned inward.
So, that's to narrow down my meaning, you can have that fabric face out or face in, but the pins must face you. It doesn't matter if it's whole and single layer or half and double, as long as the pins and raw edges face you.
Obviously, the seam allowance must be even, must be enough, and ideally is cut smoothy, not with whiskers or craters. Sure, there will be pivot cuts made deeply, a given. To make smooth seams easy I use long skinny sharp pins except on curves where short pins are a must.
If you cut choppy or too small seam allwaonces, this is misinformation when you take pins out. Big seam allowances allow for big, multiple, and distinctive notches. I'd be lost without them. They should be infrequent and special as well, too many distort meaning.
Most importantly, I know where my seams usually go, and the unique shaping I give to tucks. That's four things, straight, smooth and even seams, big enough for notches, seam locations that are consistent each time so you know, and the shapings of tucks. That goes a long way to not getting lost when experimenting with taking out pins.