Richard,
The Epson driver (or any driver) doesn't "know" anything. It was written with assumptions about ink densities. Inkset design can incorporate these assumptions and open use to a wider audience. The Eboni-6 design is Epson driver compatible.
In fact, the Epson cross-overs are very flexible and well designed. I have had them work well with cross-overs that range from a dilution ratios of 50% to 20%. That is a huge range that might be able to absorb whatever is going on with the inks (that might well include upstream issues that are no longer worth pursuing).
While you and I may love to play with profiling of third party inksets, most photographers do not. Even if they eventually get down the profiling learning curves, what people need, in my view, is positive feedback -- a good looking print. These issues can be very frustrating, and the Epson driver just might be a way to cut through it all.
Don't get me wrong, I use QTR for all of my B&W printing, but I also think the Epson driver compatibility is an important attribute of an inkset that is aimed at more than techies.
FWIW
Paul