> The argument that decentralization (diesel or renewable) helps makes sense to me.

Sure, but also in the real world, fossil fuel infrastructure is always centralised. "decentralised diesel" might exist in the sense that you can run lots of generators all over, but that's energy consumption not energy supply.

Those generators have to be supplied with fuel or they're useless. That supply is always centralised. Fossil fuels cannot be decentralised in the same way as solar.