Kinda pointless to jump into the fray so late, but I like to make a few subjective comments here. I value ARS, I also value the evolutionary nature of HIFI. To me Audio-gd is a grown-up DIY hobbyist business. The proprietor doesn't make any secrets about it. Plenty of components in the box? Sure because he is not connected with commercial chip factories that will condense whole circuit boards into a single chip. That cost $$, eliminates component failure potential but also removes further tinkering with the circuits. Because you better be 100% sure that your circuit design is rock-solid, tested, tried repeatedly. Less noise/better measurements for sure.
BTW, Burson makes a good business out of "discrete op-amp design".
Wind the clock back 50 years and imagine how people would react if the Dynaco ST70 self-assembled power amp hits the market. Was it taken seriously back then? Clearly, there were less equipment choices and it was a much smaller market.
I am operating two Precision 3 amps for 4 years now in two of my modest stacks: Dynaudio Contour 20, Excite 14, Denafrips Ares II, SMSL SU-9, Burson Conductor, plus vinyl gear. The amps are performing flawless so far, warm, rich sound, great dynamics under low and high gain conditions. Even when driving the Contour 20's hard, a single P3 holds up well. $500 incl. shipping. You get what you pay for.
In the marketing section for the P3, they directly talk about the diamond-cross output design (late 60ties design - not very successful) "not measuring well" and the pro and cons for using the design. I do not see deceptive advertising, perhaps some omissions with providing measurements.
I wonder how well a Dynaco ST70 would measure....people still love these amps.