Why shorter games?

What's the reason behind shorter games? League used to be a strategy game where any team could outplay the other if smart enough even when behind. Now the game is decided within 10 min. As soon as the bot tower is destroyed it's gg, enemy team just comes 4 mid dives then can smash through the towers getting an inhib at 15-20 minutes. Towers are so weak right now they get melted and you can't defend because you will just be dove. Why not make the games longer, a tower buff is needed. The longer the game the more chances there are to come back from having a bad team.
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