I don't doubt it, but I haven't had that issue in my space.
Johnny Cash was recorded by Rick Rubin in a livingroom with Persian carpets draped around!
For monitoring, I think a lot of expense can be saved (and perhaps impossible expectations left aside) by simply monitoring mixes at lower to mid volume, with the monitors placed away from weird corners, or not too close to walls. I doubt my space is anywhere near perfect, but I can successfully record/mix for professional broadcast without having spent more than $50. for "treatment.