No idea on the "political reasons." I remember seeing a post by Jason Stoddard on the Schiit blog that they had briefly experimented with a similar circuit to the TubeCAD schematic - basically a two stage diff amp input, diff amp output, cap coupled with no negative feedback, but decided against it. The Rudistor Egmont is similar design if I'm not mistaken. According to someone who has built both an Egmont and an SRX Plus, the latter sounds significantly better, for a modest increase in parts cost.
I had a chance to compare my Stax SR007 Mk2.9 with port mod to the VOCE this weekend, driven by a BHSE, at the New Mexico meet. They sounded pretty similar in tonality, but it was a brief audition, so I hesitate to say more. One of the others who listened said he thought the VOCE had a more even frequency response, but that the Stax seemed more effortless, and a third listener noted some differences in soundstage presentation, but he didn't go into more detail.