In one particular video when tubes were being discussed, he admits that although admiring the virtues of tubes, he was a SS designer and as such didn't employ them. Enter, Bascom H. King. In his interactions with Paul, he convinced Paul to utilize tubes in his BHK amps and preamps. Paul admitted in the video that it was the right approach and contributes to the excellent sonics of the BHK gear.
That's an audio designer that I want to listen to. He allowed himself to be taken to a new place in the design process even though it didn't fit his established paradigm.