Agreed, although technicalities should be less subjective than tonality, at least in terms of assessment. I mean, it should be easy enough to score resolution, stage width/depth/height, imaging, separation, dynamics on a scale. Especially if you have such a large basis for comparison.Well, there are a lot of different elements to technical performance. And priorities differ between people on what they want form a technical stand point. There are other variables in play too in how someone hears and evaluates something. It's never going to be an exact science, and technically grading gear will be to some degree subjective too.
That said, and as with everything else in this hobby, it seems YMMV applies to this too. Just because I'm hearing more details with one IEM over another doesn't mean others do.