> More energy density in capacitors is a big thing, as capacitors are easily the biggest parts you will have to use on your PCB Not really. Most modern electro

> More energy density in capacitors is a big thing, as capacitors are easily the biggest parts you will have to use on your PCB Not really. Most modern electronics don't need significant capacitance in F. Your selection of capacitors will be dominated by a very large number of physically small, low-value bypass capacitors, one each placed as close as possible to every single power pin. The main thing you care about is their inductance - which is why you want them small and close to the pin. I'm already using the smallest parts the factory lets me without charging a premium fee, so nothing to gain here. Beyond that there might be a handful of bulk capacitors distributed among the power rails, but those are rare and already rice-sized. Making those smaller wouldn't hurt, but it's not the first property you'd be selecting it on, and the potential gains are pretty much wasted on anything which isn't an iPhone. There are still some rather bulky capacitors in things like chargers and power supplies, but those aren't exactly space-limited.