What an absurd analogy. Of course it's worth spending time when deciding if billions of dollars are worth spending on something. It's worth entire individual lifetimes of effort if one can save that much money.
I identified ways to save 30 times that much money in this thread. It is more productive for you to focus your efforts there.
So, it's not going to cost $5B? Better inform those building it.
I just think it's silly to focus your efforts complaining about $5B being arguably somewhat inefficiently spent, versus hundreds of billions of dollars going straight into the garbage. There's far better things to focus on if you're concerned about money going to waste.