Maybe at first glance, but if your psychedelics work well at all it should be pretty hard to bash that headspace.
If you're thinking one day: it would be nice to trip, I wanna go to the park but the substance can't be too heavy or work for a long time etc etc. So what you're doing is trying to map these substance a little based on their differences. It's a practicality and when you actually go to the park to trip you can just shake that off and feel wonderful. It doesn't mean you can't also celebrate the commonalities and seamless spectrum of potential!
Compare it to enlightenment. It's a good thing to work on freeing your mind, meditate and loosening your ego a little. But it doesn't mean you should totally stick to that frame of reference, because exactly that is the antithesis of freeing your mind.
Rather you want to bend together with the situation and adapt while realizing deep down that this is not what your true nature is. I agree that the true nature of the psychedelic experience cannot be fathomed but one can dabble, sure. Honestly though, I don't think you should rate psychedelics by something like just a number but if you would start a thread asking about the intensity of 2C's I'm sure enough people could order them. Does it have any use? Not all that much to me, but it might help someone get a better grasp of the playing field.
This view is often skewed though, because like I said before there are 2C's that are often take in relatively low doses and are called mild, even though at full doses they too have amazing potential.
As long as we realize that our analyses can't actually capture the experience we can try to label aspects and even rate them. There is a big risk here I have to admit, which is that too much emphasis is placed and that people will abuse the analyses to think they can know something they can't - most of all how a drug will turn out to act on them.
Now that I think about it some more, it would be a very hard job to try a range of 2C's for instance and use doses that are the maximum to be taking comfortably, then rate their intensities. They just lie really close (though something like 2C-E really has way more potential).
But I've never heard anyone say that 2C-B is more intense than mushrooms unless they have a significant PEA sensitivity, doses don't really matter here do they? Because the action is just that different.
This last thing just tells you it has to be untrue that comparisons and rating is pointless. How many times have people asked: what is a nice psychedelic to start with? with people answering: well 2C-B is a pretty light one!!
It's not all Taoist indefinability from every point of perspective, it's not about truth, it's about if descriptions are helpful.