Unpopular opinion: experienced players know when to "go next"
Inexperienced players believe that any match is winnable, even when their team is two minutes away from a crushing defeat. Giving up isn't a very positive attitude, but it is a sign that the player understands the mechanics and strategy of the game such that they have a good idea of which Nexus will eventually explode. I know Boards prefers longer matches, but a 25-minute match where the last 10 minutes is spawn camping and spamming emotes is no more of a strategic braingame than one that ends with a unanimous forfeit at 15 minutes. The only interesting gameplay is that required to decide a match, not necessarily complete it.
Requiring 4 votes to surrender is an insult to a team's superior players.