I agree with @Francois_Russo’s point. The review is based on only one source, and I think that with any headphone or iem review, the use of multiple sources would be helpful to the reader, especially if the iem/headphone is difficult to drive, as the reviewer states.
The review also compares individual aspects of the Traillii with individual aspects of other iems (e.g. the bass is not as good as the bass on X, the treble isn’t as good as the treble on Y), but there aren’t any overall comparisons. Unless there are some ‘Frankenstein iems’ with the best of everything, it makes it difficult for the reader to decide if a different iem should be purchased instead.
I wish the review had been a little less angry, and a little more informative.