The LEDE - live end - dead end and/or diffusion treatments work well, but work better in large or larger rooms. Unfortunately in small rooms ( i.e normal bedrooms or studies, etc ) is that dimensions aren’t big enough to allow a far field to develop. And while of course no wants an anechoic chamber it’s better to err on the side of absorption because in a normal domestic sized room what comes off the back wall will still be classed as ‘Early Reflections’ and scattered or not it will smear the sound.