Do the best you can and then enjoy the gear and the music. How do audiophiles sleep at night suspecting that their system is only 97% of what it could be? How can you stand it?
I guess that is Darwinism at play. The happy, satisfied tribe got wiped out by the angry tribe that took their nice river view. So the angry tribe propagated.
To answer the OP directly, it’s because room treatments is more like terraforming wherever you are stuck, and the angry tribe doesn’t want to terraform, they want what’s over the hill where the happy people live. And when they conquer that, there’s another hill with a happier tribe beyond. We could all use to be reprogrammed to be a little more satisfied and a little less "grass is greener."
Now I'm going to go back to swapping cables and installing my new gear...