A couple of things.
It’s definitely a player safety thing to get more space in the corners. I remember multiple incidents where I was worried a player that crashed into the wall wouldn’t get up. It won’t affect home field advantage, the only time players are in those corners are when they score. Fans will still be right on top of their bench and just about 5 feet or so further away in the corners.
I kind of like black in the endzones, but I doubt we see that. In the heat of the summer it would be very hot for stretching lines. Also, black would fade pretty quickly in the sun and look like crap a few years in. I can’t think of another turf field with black as the base color for their endzones.
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