So I'm mostly in the never surrender camp myself when playing ranked. Especially when you're climbing, you're never really out of the fight until the nexus falls. If the enemy team screws up you can turn the game in one death timer. Those sweaty comebacks are some of my most memorable games.
I just don't think there are enough people that want to opt into that to justify spending time on the option. I think stuff like hiding surrender is better because it hits all players without them having to do anything. Just spitballing, but I think repeated surrenders from the same person are a better thing to look at. You don't need that one tilted person dragging down the mental of the rest of your team too. Sure you could turn off surrender for yourself, but if you've already got the grit to keep trying to win, the surrender you see isn't the problem. It's keeping the rest of your team mentally in the game to comeback with you.