I agree with you to the extent that the rear end would be identical in spring & damping rates. I could not detect any difference. The front is obviously differing in spring & damping rates, which works the rear end harder in the BRZ and offers greater front end composure at expense of ride comfort. Bear in mind that a 10% increase in spring rate in the BRZ front on a 1260kgs Coupe is nothing to sneeze at in terms of changing handling dynamics. Up to 10% increase in my Volkswagen Driver Gear Springs on a 1380kgs hatch has made a tangible difference.
The MOTOR Mag article provides all the evidence you need to decipher the differences I have experienced. Stiffer front end has ABS cutting in earlier in the BRZ. One twin stops 1 metre shorter than the other for 100-0kph stop. FT86 had a faster lap with the softer front helping point the nose into the corner. The BRZ did better in the hill climb with the softer relative rear end aiding traction uphill. The different stats on each twin is tangible evidence that they go about things in different ways. Even subjective driver ratings had each twin rated differently for driver satisfaction. All the evidence is in the article itself.
Furthermore ... Wheels Mag and Top Gear Mags are also citing tangible differences in suspension tune & feel. I’ve driven both in order to decipher myself if the differences are apparent, and they are apparent. Does this make it any easier in choosing between the two as an ownership proposition, having driven both, ... No. It only makes it more difficult due to subtle differences on paper than offer a palpable difference in drive experience & handling dynamics. Interesting enough ... the Toyota offered more vibration through the gear ****er than the BRZ. Go figure.
Cheers.
WJ