Thank you for noticing. I am always trying to explain to vehicle dwellers, off the grid users, and housed people who have solar how DC -> DC rather than DC -> AC -> DC is the way to go, but people can't seem to understand beyond the AC that they get in a usual house from the energy company.

Any efficient “DC to DC” converter is going to invert DC to AC as step one. If you need different dc voltages, an inverter coupled with various ac-dc power supplies in low power applications is perfectly fine.