In Sonarworks, there is a ready-made preset for stereo Hi-Fi listening in a typical room, this preset is designed by professionals and gives a good result in any typical room:
Dirac and ARC don't have this preset, which is bad, because it forces you to adjust the sound "according to the feeling", and not in the right way.
In my opinion it is safe to say that these DRC products target slightly different audiences, which is why they have slightly different feature sets.
My personal main issue with Sonarworks was lack of target curve and correction customizability (which I'm sure some other users might actually prefer). Other thing I noted was lack of filter sharpness in the bass vs other solutions.
Now thinking about it - it might also be interesting to look more deeply into HF range correction, as it may give some insight into how and if a DRC does FDW/smoothing/averaging - I must admit I haven't looked into that much in my time doing comparisons, but I suppose one can deduce a bit from the filter responses I posted before.
And yes, I did test the B&K 1974 curve in SW too - it was better than default in the far-field, but I still felt it was not a close enough match for my speakers and room. That is subjective of course, which is why I suggest to give more value to the objective data provided from my tests.
In general, I agree that it can be difficult for a non-technical person to get room correction right, and I applaud SW vendors who try to streamline and simplify the process for the end users - however IMHO for now there doesn't seem to exist a simple, 'one-size-fits-all' solution to this problem, unfortunately.
I do believe all of the DRC solutions were designed by professionals, though.
Similar to how many different in-room target curves available today (not just the one from B&K) were often the result of research of professionals.