I guess they must like the V-shaped tuning/sound better. My V90 aren't bad but they have a little 'artificialness' to the sound (tone?). I'll take the bass and smoothness of the Blon any day.
The BLONs and V90 are very different animals due to their different transducers (drivers). One is a single Dynamic driver (DD) and the other a hybrid with multi BA (balanced armature) drivers, and they have different strengths and weaknesses.
The single DDs tend to have better timbre and tonality (like the BLON), but the multi BA/hybrids like TRN V90 generally have better clarity/details/instrument separation. So it depends what u want in your sound signature and what genres of music u listen to.
I haven't heard the TRN V90, but the previous generation of multi BA/hybrids like the KZ ZS10 Pro and **** had outstanding techinical abilities, but they were too artificial in timbre for acoustic instruments for me, and I gave the ZS10 Pro and **** away after I heard the BLON BL-03, cause I mostly listen to classical, jazz and acoustic. I saw u are getting the BLON Cardinal in the BLON thread, u won't be disappointed if u are looking for a good timbre, it has one of the best timbre I have heard so far.
I auditioned a summitFI QDC Anole VX (10 BA, > $2000 USD) last week, and it blows away all of my other stuff I have ever heard in the last 15 years of using IEMs. Details/clarity/imaging/instrument separation were on another planet. IMHO, the VX's timbre for acoustic instruments was excellent for a multi BA set, but was still a tinge not as natural as the $30 USD BLON BL-03.
But the good news is that CHIFI stuff in the sub $100 market is of high quality nowadays, and we have different options for different folks. We can even get both a TRN V90 and BLON BL-03 to suit different genres and moods, without breaking the bank. YMMV.