Diesel is not really "less refined" it is a different distillate of crude oil, and contains heavier molecules. I think major contributor to its worse atomization is it's higher viscosity and lower vapor pressure at room temperature. It just evaporates a lot less readily. If you've never handled gas and diesel, diesel feels a lot oilier and if you soak a rag with diesel vs gas, the gas will evaporate a lot sooner.
Also gasoline has a strong distinctive smell while diesel just smells weakly like any other petroleum product.
It is not possible to pre-heat the diesel to a certain temperature, allowing better evaporation?
It gets hot going through the fuel pump.
Well, now that we’ve got this advice we can start Tesla For Diesels.
Perhaps but car manufacturers will point fingers at higher sulfur content in lower-graded diesel. Other issues like fuel filters and water traps performing sub-optimally (due to age or lack of replacement/maintenance) can introduce contaminants that further exacerbate the situation, surely there are sensors for this.
People also deliberately disable the DPF between annual checks here in the UK. The DPF equals lower emissions but also worse mpg.