Yes, I’ve also wondered before about what might happen if the 2.7 baffle were further re-enforced. Though not being a speaker designer, I wouldn’t know the trade-offs. I’d imagine that if, say, you tried to re-enforce it from within, adding thickness with some material behind the baffle, you start intruding on inner cabinet volume, which could screw up some other parameters of the design?
BTW, I’ve now heard the much lauded Kii Three speakers twice, which use DSP to correct both for frequency response and time/phase coherence.
Maybe I still haven’t had a good demo of those speakers, but in neither set up did they sound as timbrally natural to my ears as my Thiels, nor did they image with the specificity and density of the Thiels.