I have looked at some TFZs and read your considerations about the brand and you are right in your comments.
I am not saying anything new if I say that TFZ bass are their reference and have a special sonority. In my opinion they don't sound like the bass of NF Audio NA2 NM2, even Ikko, with their OH10. The Live X model has a more emphatic bass and has a speed similar to the cheaper models I am talking about. But the sonority is different, as is the tuning.
I also have the Tequila 1's, which were not so focused on the sub-bass and were open. It seems that the new Tequilas are closed, so that advantage over the soundstage could be lost.
In my opinion, TFZ should improve in technical aspects, even from the bass. I think they are getting better and better in this aspect, but they should improve the integration with the rest of the bands, not polarising their tunings so much in those sets with a clear emphasis on bass. I would like a tuning not so much in V in those next Tequila Pro, with closer mids and some more treble extension, without the classic treble cut for control. Plus an improvement in their analytical capabilities.
There is some of that in their cheaper ranges and I reviewed the My Love IV with surprise, for its frequency response (I'd forget its capsule design). It is clear that it is not a bass-head set, but more focused on midrange and treble, but preserving quality in the bass. They still need to improve technically.
But recently they have tried again, with a more economical set, which can be bought with only its capsules for 35$, called TFZ T2 Pro. This one follows a very similar line to the My Love IV (with a slightly more normal capsule) and a slightly different tuning in the mid to treble transition.
I will write a review soon, just as I hope to review the TFZ Tequila Pro.
I'm not trying to justify TFZ, I'm just explaining their status based on my own experience.