Something else occurred to me: DC-DC switching is an inherently noisy design.  It produces switching spikes which are notoriously difficult to filter.<p>If you are working on an electronics project which is sensitive to noise, you currently have the option of ditching your cheap, efficient DC-DC bench power supply and instead using a linear power supply, which is far less efficient (instead of producing the desired voltage by converting power, it does so by turning the extra power into heat), but is a very low-noise design.<p>If we switch to a DC grid, there&#x27;d be no point in using a linear bench supply to develop a low-noise project, because those nasty switching spikes you were trying to avoid aren&#x27;t coming from your supply, they are coming from the grid!