If you’re thinking about a windfall benefitting a seller the flip side is that the buyer paying it is being punished. The flaw with that line of thinking is that it isn’t personal. At any given time the market is what it is.
I think it’s a wash. The developers aren’t building homes to fulfil some altruistic responsibility to the public good. In buying any home from any seller a buyer is supporting the pricing structure in effect at that time. If you’re buying from a developer that transaction still supports the pricing structure for the resale home, even if indirectly.