It's in german for a reason, bud. Get your facts straight.

hohoho

Ignorance is bliss

Did she play that, where can we hear it ?!

I think the secret sauce that set Wendy's recordings apart was a custom feature that only she had: a prototype keyboard with aftertouch and velocity sensitivity, which allowed piano-like expression. I believe it was the only one in existence at the time. The standard production Moog keyboard had simple on/off response like an electronic organ, which is what every Moog player other than Wendy used on all those switched-on albums. Result: that curiously stiff and mechanical (or as you say, bland) sound that plagued so many of them. The relatively unsubtle and cartoonish synth patches those guys used--total cheeseville by today's standards--probably didn't help matters either. I doubt many would-be Moogists of the time had either the technical skill or the patience to coax the kind of expression from a stock synthesizer that Wendy Carlos had in abundance (she was, after all, Bob Moog's main beta tester and helped design several of the core modules).