Comment by ben_w
> If a bridge engineer claims he now needs 30× as much concrete to build the same bridge as he did 20 years ago, and the reason is his/her own conveinence, that would not fly.
By itself, I would agree.
However, in this metaphor, concrete got 15x cheaper in the same timeframe. Not enough to fully compensate for the difference, but enough that a whole generation are now used to much larger edifices.
But it only shows how wasteful your new bridge is. Concrete being cheaper does not mean you somehow need to use more of it.