Honestly the finish is pretty much the most important part of the match, and I don't mean just simple disagreement about who wins, just the whole presentation of a finish and how we got to it can change the entire feeling about a match. Say it's a great match up until the finish and then it's just a really stupid convoluted ending that leaves you wondering what the fuck they were thinking, completely takes you out of the experience and makes you sour on the whole thing, at the same time the opposite is true and it's a mediocre match and has an amazing finish, makes the whole match feel like it was better than it was.
Also I don't see why the Rollins/Reigns match even brought up the discussion, like I can get someone disagreeing with Reigns winning (Although with how wins and losses mean absolutely nothing it just feels nitpicky at this point despite how they book him) and they could have been a bit smoother doing it but the finish is fine, a back and forth match ends in Rollins' finisher being dodged and used to set up the Reigns' finisher, all while still having the kayfabe shock of a missed finisher giving it a more out of nowhere feel to Rollins and Reigns picking up the win off of that, if it wasn't Reigns people wouldn't be shitting on that finisher, it was a fine finish, especially for a TV match.