It happens that Chris Green formulated :
I quite agree that paying efficiently by DD makes sense but that isn't
a reason for the extra 'layer' of paper pushers (or DD pushers)
between me and the actual producers of electricity.

I know you can, but would you expect to always go to the farm for your
milk, for your fruit and your veg? Would you go to the refinery for
your petrol and diesel? To the weaver for your clothes? To the printer
for your books? To the manufacturer for you car. There have always been
middlemen and always will be, because there is a very obvious need to
separate production from distribution and retailing.