And every bike magazine tester has panned the AE. They are all very experienced riders and ex-racers who love enjoy the more total control they get with a clutch.
That being said, there are many happy AE owners on this forum who do commute with an FJR so the theory of having YCCS on a smaller displacement, different use bike may not be the best point to reason from. IMO, the largeness and torque of the FJR make it the best candidate for YCCS rather than on a smaller bike with a smaller displacement engine with a more "peaky" engine performance curve.
In its current iteration the YCCS does a good job. The one I rode at WFO in Reno did excellent upshifts but I am a little better at smoother downshifts. That being said, with a little practice and pre-thinking before the downshift (Read: technique, i.e., my decision processes would adapt to the bike) I would think anyone who is thinking of purchasing an AE would have nothing to fear. Especially those with physical limitations (missing digits, arthritis, age, etc.)
As to a discussion of its failure in marketing, that will not be known for 5 or 10 years. They're still available so Yamaha hasn't given up on the idea. Its a shame that so many people rely on everything they read in magazines without taking into consideration the background of the tester and how that affects his presentation.