I think the biggest problem is that: every play that doesn't result in a goal is largely inconsequential. Sure, if you're dominating the game, you'll have more momentum and so forth. But still: about 85-90% percent of the plays do not result in a numerical score and thus are largely inconsequential.
Also, while I suppose it would be best to search for research on the subject, I would tend to disagree with your assessment on the likelihood of comebacks in various sports. My impression is that in hockey, if a team is down 4 or more goals, a comeback will happen only about 5% of the time. But in a similar situation in baseball, say if a team is down 6-0 at the end of the third inning, a comeback seems much more likely (perhaps around 11-14%). You can always tire out the starting pitcher and get to their shitty relief player. As long you can get men on base, there is a chance to at away at chunks of the lead.
When they said "sit down", I stood up.