There is the Item Level scaling still. But the problem I explained in my post causes it to still be overpowered, especially if they use their primal abilities. And this is why the "additional abilities" and "potency" factors would need sorting.
I have thought that they could achieve sorting the potency issue by reducing the potency, using the level difference between the attack and the dungeon as a percentage to reduce the potency by.
Unfortunately, reducing the potency as I just described wouldn't solve this issue of us having access to abilities like Bloodwhetting that just completely unbalance the content regardless of potency.
What plays into all this is the fact SE has rarely ever revisited old content. It took 7 years before they revisited the ARR story and the whole 10 years before they had revamped all the old MSQ dungeons. So even if they were willing to do this, the chances of them having much focus on anything old is low. A single sidequest dungeon revamp is about the extent of it at the moment.