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I have the same reservations about dsp but it's tough to get around the low frequency modes caused by the size of the room. Most of us are stuck with non acoustic parameters to work within, I feel fortunate just to get one listening position sorted.
For mixing near fields solve most of the problems for me, producing with instruments is a whole different battle.
Airhead-
You have PMCs right? They're on a whole other level!
My nearfields are decent enough (Focal CMS65) but I have them a bit further away now as I recently got some mixcubes and this is really highlighting the problem with the room. Focals are getting 'vibe' duties with critical stuff on the mixcubes but the nature of them means bass and top end is a bit of a guess, so I need to deal with the big holes at 90hz and 150hz. Some scatter panels should deal with the flutter echo too.
Dramatic_Hammer
Clever membrane based stuff can cut the size down fairly dramatically but yeah it’s still not ideal home stuff. From a music recording/mixing perspective I think these dsp things are interesting when applied to headphones to emulate spaces or different speakers but fairly useless for speakers without room treatment. Changing the amount of a frequency doesn’t change the room modes and the temporal and listening location issues they cause.