It's funny to me people don't "get" the grass stains, mud etc. It adds another dimension to the game, to the personalities of teams, weather, climate, etc. "Frozen tundra," etc.
When the Minnesota Vikings got a dome, they lost a lot of their personality and became more sterile and boring to me. I remember when they had to go to L.A. to play a playoff game with the Rams and it was supposed to be a huge advantage for the Rams that year; but it rained torrentially that day in L.A., and within minutes you couldn't tell which team was which or where the yard lines were. And...it was awesome!
If that game had been in a turfed dome, I probably wouldn't even remember it.
I'm not a big fan of injecting another dimension of boring expectation and similarity into the game. Let the elements matter.