Having tried three types of room treatment in two awkward rooms and comparing these to a one room that is close to ideal. I tried Dirac (Datasat and others), Trinnov (both multi and 2 channel / 2.2 channel) and Lyngdorf "roomperfect".
Only Trinnov gave the level of performance and integration I was looking for (initially tried ST2 HiFi, then Amethyst). I have glass on two sides in awkward places in one of the rooms and on all for sides two with awkward places in another. The difference between on correction on / off and completely bypassed (just to check against 'off) is huge.
But I acknowledge that some of the DSP benefit is that in both instances I am using speakers with smaller bass drivers than I would like and consequently I am integrating speaker arrays / sub integrations which would not be "an advantage" in a 2.0.
However, where one of the sets of speakers I use are 2 way then I found the dsp crossovers were for both a single seat and especially for a multi-listening position more effective than either single or bi-amping without correction. Comparing this to the set-up in the 'ideal' room gave a 'awkward room' performance that was quite close. Even the 'ideal', gained in timephase precision.
To be clear I am not in anyway suggesting that physical correction should not be undertaken or ignored. But in cases where I simply could not remove windows, etc., Trinnov DSP did and excellent job.