This is clearly an unwinnable argument, and I think the two sides need to agree to disagree and move on.
Statistically I think the vast majority of coastal cruisers appreciate a more nimble, maneuverable design than your typical full keeler. But it's great that those who prefer that style still have boats around that will fulfill their needs. And for ocean crossings, while the relative merits are obviously still debatable the main shortcomings of the full keel are far less relevant.
That begs the question, where are these boats?
The very fact that very few builders are still producing such boats, however, pretty much answers your question, GB. Duped or enlightened?? To each his/her own.