Not clear where the disagreement is, Rish.
Standards cannot provide consumer choice, any more than TCP provides consumer choice if there is only one provider in town. Standardscan support consumer choice, especially when built into an application, or when they enable market rule-makers (PUC, etc.) to open up markets without undue re-casting and re-building.
Agreement maps to the Market Context.
For wholesale, that market context is likely to be each ISO or RTC. They have market rules, and all EI can do is enable them; A communication specification will not define the market rules.
For most retail, the market context is the program, which today is usually some sort of Tariff. Whether they can opt out or not is based on the terms of that tariff. We cannot enforce choice, there, with this specification. We can only enable it. FERC, even, cannot enforce choice there, they can only urge the PUC's to.
If the question is, should we use the same list as in Wholesale, I think that list is up to the VTN and the VTN/VEN agreement. Bruce's lis is a fine one. If the Oregon PUC mandates that the local utilities add "Bad Hair Day" and "Raging against the Machine" as options, then EI should support that (meaning no fixed list).
Perhaps I am being dense, but I am not sure what I am missing here.
Opt-in rights, Opt-Out rights, et al. are conditions of the Agreement (and its "sub-class" Program), and as such are outside the scope of this agreement. Constellation, at least, has publicly demonstrated user interfaces to support both opt-in and opt-out.
Energy Interop makes no assumptions about what it is apropriate to say, or what agreements should say, just what can be said.