I agree with you, and the thing is that most arenas ar multipurpose, so it would be really difficult to shut down to do all the necessary adjustments. I don't know how long it would take to adapt the cooling systems to the bigger size
I found this cool time lapse
Cool video! And here I thought they just put a floor over the ice.
To answer the question, I think the game is ok the way it is. High scoring games are fun, but if it only happens a few times a year. If it's every night, no thanks. I think the perfect hockey score is 3-2.