First: No, they're not. That is an unreasonable expectation divorced from the reality. What exactly do you think would happen if everyone in town switched off and on their AC-powered devices at the same time? What do you think would happen if everyone in town moves to the same street and starts using their cell phone to stream 4K videos at the same time? Do you seriously think it's reasonable to expect every system to deliver at its peak with arbitrary demand and load on it?
Second: If you're going to play the "I paid for this" game: this stuff is generally in the contract anyway. It is the level of service you paid for. The overbooking possibility? You paid for it, it was in your contract. Throttled service? That was in your contract too. You're getting what you paid for.
Second: If you're going to play the "I paid for this" game: this stuff is generally in the contract anyway. It is the level of service you paid for. The overbooking possibility? You paid for it, it was in your contract. Throttled service? That was in your contract too. You're getting what you paid for.