I won't disagree with you on that, this is truly subjective. I meant people who have been vaping a while, seem to have pretty stable tastes, and whose tastes generally align with mine

I likewise know other people who have been vaping a while, stable tastes, who I respect, whose tastes are just plain different. I wouldn't mention things if I had neither vaped them nor heard multiple positive reports from people whose tastes seemed to be stable, but will mention them if others who have vaped a while say they are good (within whatever flavor category is being talked about).
Not connoisseurs, but rather the mix of stability and similarity in taste, with the ability to call it if they buy a new batch of something and notice a difference in flavor (vendor got some bad base flavorings in, and/or changed the mix).
A similar situation plays out in the hardware side. I like certain attributes in my PVs and cartos. There are a handful of people who if they say I really ought to try product X I likely would. There are others who like different things, who I know and respect, but know that what they are seeking is different and/or that they simply like to try different things; not bad, subjectively, just different.
Concerning the JC TC and the Ikenvape RY4, I've had several people ask if I had any insight into how to replicate them. These are people whose tastes aligned with mine on at least several tobaccos in the past, so the odds are good that I might like the products. Then again, my own tastes have continued to evolve, change, not necessarily in a "good" direction, just different, tending towards smoother blends over time. I suspect my latest tob6 is pretty similar to at least one vendor's RYx, I'll probably pick some up just to see if this is the case; it was not intentional copying, since I hadn't vaped the vendor product previously, I mixed it based on whim, a random request for a certain combination of flavors.