In classic decoupling designs, it is common to see a large (10 µF or bigger) electrolytic capacitor in parallel with a smaller ceramic capacitor (in the range of 0.1 µF). The larger electrolytic capacitor can deliver more current over a longer period of time, but suffers from high ESR, thus a ceramic capacitor was used to handle higher-frequency current spikes.
However, it's 2016; today our circuits run on 1.8 V instead of 18 V. We can easily get ceramic caps as large as 100 µF in the voltage ratings we need.
Is there any reason we still need the classic 0.1 µF + 10 µF design? Why not just go with a single, 10 µF ceramic cap, which has similar ESR as the 0.1 µF?
I ask this because I've seen a large number of reference designs that have switched their polarized electrolytics over to ceramics, but still use the multi-value parallel approach. In one particular reference design, I even remember seeing a 22 µF, 0.1 µF, and 0.01 µF — all ceramic — run in parallel.