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Mmmm.... my sense of stagnation came from a few things. Their UDP80 amp appeared, then disappeared, then re-appeared without comment with only one new review. There were some comments about the 9038, including one asking them to respond to the Audio Science Review and several with questions for the manufacturer, and no one from hifimediy seemed to be answering them. Most of their power supplies appear to come from other manufacturers, so I didn't see that as real activity from the company. Honestly, it all made me a bit nervous. I also just wanted to try another DAC maker.
I've actually been something of a fan of hifimediy and have bought several items from them. Throughout that, they were always quite responsive. I used one of their amp modules for a couple years, but was pretty surprised to find that the Volt+ board with the tpa 3118 chip sounded a lot better than my hifimediy boards. I was also surprised that they never stepped it up from there. The uda 18 was in my system for 2 years and I'm probably going to keep using it as a headphone amp. I think Audio science was equally hard on the uda 18, but I thought it sounded very good. I still use their early USB 9023 dacs with my cell phone, chromebook or android tablet from time to time and they hold up really well as a portable solution.
So far I really like the d50, but would like to hear the UDA9038 or its successor some time. If I do, I might come to the same conclusion you did. I'm glad to hear that hifimediy is still at it.