This could even be related to the selfie flash business they started with the 6S.Im afraid you aren't correct. Every single year people claim its intentional. And every single year, after a month or so, the good screens return. Apple has made no statement that the warmer screen is intentional, nor will they. That myth, along with the glue drying, gets floated every year to calm people down. Yet every year we are comparing warm screens to last years cool blue screens so how is that possible if every year a warm screen is intentional and "more correct"?
It's possible because after launch, the good screens return, and now we have something to compare next years yellow screens to.