Fair enough, if you want to pretend that transpositional invariance is worth talking about in any composition then go ahead. I'm not going to lie to myself and pretend that it is.
The context I was referring to with that example was mm. 1-2 of the 2nd of Stravinsky's 3 pieces for String Quartet where there are 2 chords split across the barline that are both transpositions of pc 4-8, A being T=4 and B being T=3 (Hence the T=11 between them). While you were busy pretending that set theory is useful, the rest of us had already noted that A was a transposition of B and that the two chords had 2 notes in common and then wondered whether this may be something which is likely to recur throughout the movement and we did it without resorting to mathematics or pretentiousness.
In fact, looking at that example again, I could probably take the pretentiousness further and start talking about the interval class vector of the set being 200121 and how that means there will be a prevalence of either class 1, 4,5 or 6 intervals. Or I could look at the score for just a minute and see the clear harmonic focus on stacked 5ths/tritones. Which is the more useful observation?