I just lost my second game where the teams were fairly even, all the enemy turrets were down, but we lose a team fight and just get rolled while we're waiting ~70 seconds to respawn.
When we kill all the inhibitors in a raid, we'll keep them bottled up in their base for minutes while they run around killing minions, but farming hardly matters at this stage when we're capped out on equipment and blowing money on pots. Baron and dragon are killed every time they're up, but the buff seems slight at best at this point. Our team composition was probably worse at this extreme late-game, where they had 2 good ranged AD/AP carries that could easily focus one of us down at a time, but is there any way around this?
If one or two of us died despite all lanes pushed to their base with super-minions, they would smartly dive while leaving one of them at base to manage minions. We tried just sitting in a bush in their jungle waiting for them to split up, but any time we were all up they barely went 2 feet outside of their base.
How can you win games like this where your extreme-late-game composition is worse than the enemy team and their carries turn semi-tanky?