Nice review, though I cringe every time I hear an AMT referred to as a "ribbon."
I'm a big fan of AMTs for their generally low distortion, and my enthusiasm for them skyrocketed when I started using larger AMT mid-tweeters from 2kHz to 6kHz and smaller AMT tweeters above 6kHz, with DSP EQ applied, in my active DIY arrays.
Erin is absolutely right: too many manufacturers routinely boost the top end on pretty much everything they build regardless of the tweeter technology applied, (for that "showroom curve"?) leaving it up to the end user to do some correction. As Amir has pointed out, you really ought to be using EQ anyway to address room resonances so you might as well tweak the rest of the spectrum as needed.
As an aside, we visited our birthplaces and friends and family back in Alabama in June. We were fine in Mobile, where I'm from, but after our visit to north/central Alabama (where Erin lives) Dr. Horn and I both contracted COVID, verified by tests. Ugh. We had both received vaccines and two boosters long ago when they became available so our reactions weren't enough to put us in a hospital and we recovered quickly.