Lets just get this out of the way first, just because TLOU 2 is more open doesn't make it more demanding than TLOU 1 remake. There are a whole bunch of linear tech demos that invalidate this line of thinking. Now to address the rest of your points, like I said, I don't know why it runs this way. Clearly something changed with the uncharted collection port and this one because the outcome is drastically different. You're free to speculate as much as you like but at the end, it's just baseless speculation because there's we don't have any information. Those who have access to the devs can ask and get a definitive answer. Until them, everyone is just blowing smoke from their behind. Who knows, you could be right but, it would be merely coincidence.