Why would Keystone remove egress windows from newer models?

I don't think that's it, as the egress window in the front bedroom has a screen and works for ventilation just fine. From what I'm reading in NFPA (which is part of the RVIA) sticker on the side, each sleeping area must have 2 exits. The door is one, but there must be another one. As I'm reading it, my trailer is actually out of compliance with the NFPA standard, even though they claim it meets it.
That's why I don't understand it. Is an emergency window of a similar size that much more expensive than a slider?