"The argument of untested just doesn't cut it "
Yet your argument is a non-independently tested and unreleased CPU is automatically better and should be selected based on...assumptions?
FYI, how much do you actually work with and use DAW software?
DAWbench, which is the simulated benchmarking software that the OP mentioned, has good things to say about the 3950X. The 3950X wins the DSP testing, but loses in the VI testing. In their review a few months ago, they also said
"The earlier concerns about a limited number of incompatibilities have so far not grown and we’re aware that AMD have been working hard to help smooth these out. With the platform not so much “on the map” at this point, as stomping all over it in size 12 boots, we would hope that that developers are now sitting up, paying attention and baking in full compatibility from the ground upwards on future product releases."
"I’ve also retested the common Intel mid-range selection, including the ever popular 9900K. These were amongst the last chips that I took a look a proper look at and throughout 2019 remained popular options, still offering a strong solution where the utmost compatibility is concerned."
"First off the big omission is the new Threadripper chips and model dependent I saw two different problems that tripped me up here.
In testing on the 64 thread 3970X I saw it refuse to run cleanly on the DB VI test at a 64 buffer, where it simply crackled constantly with little to no load applied. It did run better on a 128 buffer, but the score still placed it behind a number of far weaker chips, so it didn’t look to handle itself well. The 256 buffer and upwards seemed to slowly creep towards the sort of performance levels I would hope to see, pretty much repeating the sort of issue’s we saw in previous generations with the low latency performance hole.
So, we thought there might be a few usable scenarios to be had, but then we ran the DSP test and hit another snag. The projects in that SGA DSP test would always overload at around 60 %- 65% load and I didn’t see a way around this in the time I spent with it. I’ve tried different memory types and speeds, but no matter what it seemed to cap out there.
That's all I really have to say on the subject. You feel free to provide your far superior advice on DAW software and hardware.