Earlier quoted context omitted.
Raytracing is a good thing, not so much because of the better graphics, but because it enables produce nice graphics with less sophisticated engines and less artist input. A lot of the lighting etc. is currently baked into textures, hard coded, hand-optimized. This takes a lot of time. With raytracing, a lot of this comes "for free", so smaller / indie dev teams can produce games with AAA level graphics.
At the high cost of performance. As a consumer I am not really concerned with how easy it is to develop for. I'd rather see high frame rates than bleeding edge graphics. It's a good technology, but if we can't even manage 60 FPS minimum in 2020 I will be highly disappointed.
I don't see how this could possibly be. Ease of development could mean the difference between your next favorite game existing at all. Or having the funds to become your next favorite game instead of cutting scope into a mediocre game that never got to realize its full creative ambition.
All upstream concerns contribute to the end result that you do care about.
Anything that helps people create AAA-quality games without needing the coffers of Electronic Arts is good for gamers.