People saying "game times are not going shorter" is just looking at it wrongly.
A plat-dia game might last 30 mins assuming the losing team doesn't give up because they are decent at base turtling, but i can tell you with a 75%+ chances of hitting it right who's winning that game at minute 10 with a 10-second look at the scoreboards.
It doesn't matter if we can turtle up, If our mid is 0-4 at min 11, i can tell you that game is over. If their adc is 3-0-1 and 20 cs ahead at min 10, i can tell you, that game is over.
Yes, it will take them 10-15 mins if we hold up because they can't inhib tower dive us yet but that game is already lost because we can't farm, we can't contest drake/herald/nashor and we can't hold the lanes 1v1/2v2 anymore. They will get nashor at 20, then come mid, then push our whole base down, back and finish the push with nashored super minions. That pattern repeats on over half of the games i play on plat 3-4.
The "never surrender" thing works below gold because people is so bad at the game there that they throw every time. A team with half a braincell that gets a lead on current soloq is never throwing it, and unless a major mistake (like a nash getting stolen or smth) happens, the game will be over before min 25.