I don't think you can blame the DCC for everything - maybe the government: yes!
From what I see in my limited recent experience of smart meters is that there must initially have been an open market free-for-all, with individual energy suppliers installing whatever meter suited them.
Hence there are so many different makes and models of meters out there working slightly differently, rather than a strict installation standard having been implemented in the first place. Must be a nightmare to maintain, as we can see!
In my case my Landis+Gyr meter isn't showing dual rates for the Next Drive tariff.
However I've come across a posting on the OVO energy website which suggests that there's a single rate-version and a dual-rate version of the same meter, so if I've got the single rate meter that could be the problem, and we can't really blame EON or the DCC for whoever specified the initial install of my meter.