I only have experience with TTC Bluish White samples and I love them, they're punchy but not too heavy, I wouldn't call this medium tactile, but when you think about it, what exactly is considered medium?
Good observations!
Yes, the concept of "medium" and "heavy" has been in flux for some time.
Traditionally, MX Clear was considered a "medium" tactile, with Holy Pandas being an early example of a "heavy" tactile. Zealio V2 joined those. BOX Brown was considered light by some, medium by others.
Then Durock T1 fudged it somewhat, because it would have been "heavy" on the old scale, but some reviewers call it "medium" because it's less than HP and Zeal V2.
Then Durock came out with "Durock Medium Tactile," similar in intensity to Ergo Clears and Zealio V1, but some reviewers consider it "light tactile."
Basically, with super-tactiles like BOX Royal; Neopolitans and custom-modded Zealio frankenswitches, it's shifted the categories towards things lighter than Zeal V2 being labeled as lighter than they were. Pushing things into a lighter category.
The old standard was MX Clear, OUTEMU Sky, maybe BOX Brown as "medium" with Zealio V1 as maybe "light-medium." But now that "medium" may include T1 and SP Star Purple, I just don't know anymore.
I think a spectrum of light > light-medium > medium > medium-heavy > heavy > super-heavy could accommodate everything, you could even drop the "light-medium" or strictly "medium" category.
Anyway, this all sounds verbose and very confused because I haven't had my coffee yet. But there is actually a more scientific way of looking at it. You could categorize the intensity by the force necessary to overcome the tactile bump, which I guess would include spring weight and tactile bump. There are ways to systematically categorize tactiles.
But if you want to be elegant, then "light" = Brown-like, "medium" = Clears + Durock Medium, "heavy" = Zealio V2 / HP, and you can attach adjectives to those as necessary. T1 still fudges it though, as I would call it "medium-heavy." I guess there are still some interstitials.
On your original point, I confess that TTC Bluish White are heavier than the old "medium," near T1s in intensity.