There is a Clear difference though between a display scratching and the oleophobic coating. The display scratching can be a result of one thing, but the minuscule hairline scratches can easily be due to the oleophobic coating. Not entirely impossible Apple didn’t change something with the oleophobic coating process, Which is naturally organic and will eventually wear off with usage. Regardless, if somebody was concerned about the display, then I would suggest a screen protector. I personally don’t have any issues with my display scratching, but I can’t speak for everybody’s experience.
It is indeed entirely possible the oleophobic application process has changed I just think it’s unlikely. Like I said, you get exactly the same claims every iPhone release.
I’m not a fan of screen protectors either nor am I bothered about the odd scratch here or there on my screen. Over the years some of my phones have faired better than others, I look after them I just don’t treat them like they are antiques.