The only tense part of the game is starting lane and first blood
After a team KDA difference of 8 or so tension disappears. evaporates, it goes to buy cigarettes and doesn't come back; at this point you're either farming or forfeiting. Snowballing is an answer to making games shorter, but not more engaging.
If I'm winning I play needlessly reckless to keep things interesting, if I'm losing I play excessively safe because sometimes they can tower dive past two towers. Burning the candle at both ends here.