It’s not just the display itself, it’s also GPU processing power and battery size that has to increase roughly in proportion to the pixel count. Of course Apple has a large wiggle room of how they can price it, also given the ridiculous premium they ask for the higher storage tiers. But screen area makes for a usedul reference point.I disagree.
An extra ~15% larger screen does not cost Apple $100 more, and since Apple likes to hit $100 price points they will likely round down that small amount instead of rounding up.