No, I didn't say that in my post, just that if one use the $20 app with Ratubuddyssey, then XT32 SubEQ HT can do a good job too. I would expect the same (or better) results can be achieved if one uses the $200 MultEQ X app.
Your point on the waterfall but I don't have too many graphs to look at, other than I know the FR response graphs show DL without DLBC weren't better when the corrected range was limited to 1,000 Hz or so, and they don't sound much different to me either.
DL's impulse response looks a little better, not sure about the waterfall, but I think in terms of integrating the main towers and my two subs, Audyssey Sub EQ HT did do a decent job, as evidence in the FR + Subs, FL + Subs and FL+FR+Subs response graphs.
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The graphs above are "as found" iirc, that is, no manual tweaks with the app.