I think something that has sorta… moved into my brain during all of this discussion about a/pep and isfet is that in a way, just like ma'at, isfet is subjective sometimes.
I mean, “the destruction of Creation” is a good generalized way of describing it, the same way that “balance” is a good way to describe ma'at. BUt once you start to get down to the specifics of things, it becomes very subjective very quickly.
A good example is warfare (which sat brought up in another thread). In antiquity, if Egypt want to war, it was to “uphold ma'at”. However, I’m sure to the people whose villages were being burned to the ground, whose family members were being brought back to Egypt for slavery didn’t think of it as upholding ma'at or creating any sort of beneficial balance.
And if the shoe was on the other foot- with someone coming in to attack Egypt, sure as shit that was an act of isfet (we know this because they execrated against enemies of the state, known and unknown every day).
Same act- war, conquering, taking over, stripping of resources.
But if Egypt was doing the do, it was okay. If someone else was doing it against Egypt, it was bad.
I think this is also noticeable with the “is illness isfet” discussion. Technically we execrate things that are isfet in our lives- and illness shows up on there pretty regularly for a lot of us. For some, the illness is nbd and maybe even improves their immunity, but for others the illness effects every aspect of their life and threatens to kill them- hence the disagreement about whether it’s isfet or not. Another example might be when you execrate a person to get them out of your life. Sometimes the person isn’t inherently bad, but if they’re screwing up your balance, disrupting your ma'at, in a way, that is like having a bit of isfet in your life.
So I think what all of this musing is telling me is that isfet, like ma'at, is not static or even objective in a lot of ways. And that there are elements of subjectivity to the concept that have to be kept in mind, and that what might be isfet in one context is ma'at in another, or that one act/item/situation can be both depending on the perspective.