Well, of course aesthetics is subjective, but having seen both in person, I'm not convinced that Woo's tubes sticking out of a box is any more attractive than Blue Hawaii's tubes sticking out of a box. Nor am I convinced by the argument that someone paying for an expensive box wants it to look different than other people's expensive box. That seems rather superficial to me.
As to Woo bashing, the original GES used output plate resistors, and was a decent amp for the price, based on a Kevin Gilmore design. The WES used output choke loading, which is a curious choice for electrostatic amps, since electrostatic headphones are extremely high impedance at low frequencies, just where chokes have their lowest impedance, resulting in poor power transfer, particularly since 50% of the power spectrum in music lies below 300-500 Hz. Reviews of its subjective qualities have been mixed. Given the record, I don't think that skepticism of a new design is unwarranted.
AFAIK, the only other choices for output loading are constant current sources or output transformers, which is anything but "proprietary" technology. With constant current sources, the available amount of gain using two 6SN7 voltage gain tubes and two 300B output tubes is borderline even without the use of overall negative feedback, raising questions of gain stability. Now, a low winding ratio output transformer, e.g. 1:2, would not be unreasonable, trading off some of the relatively low voltage limits of the 300B output tube for the higher than needed quiescent current that is optimal for a 300B tube.
Finally, Woo has been notoriously sloppy about specifying appropriate value bias supply output resistors in the past, a simple but telling indication of caring about proper design. It costs nothing extra to use a 5 megohm bias resistor for Stax and a 10 megohm bias resistor for Sennheiser stat headphones.