The guy who does my mixdowns has his studio in a bedroom and he has a whole lot of wall treatment, particularly in the corners of the room. I get the concept of cutting down on the natural room echo and stuff, but my question is this.

Everything I do is recorded at line level. I have never recorded a guitar or bass or keyboards by putting a mic in front of an amp. It's all direct input line-level recording. So why do I need to care about my room? I am not recording anything with live mics outside of singing, and when I do that I am in a foam lined enclosure that is a 180 degree hood wide enough to step into and be completely inside it, and it is all lined with foam. My vocals are completely dead in there, and what effects I may want to add will be put in digitally.

What do you guys think about this topic when put into the context of never recording open mics? Seems like I should not have to be concerned with wall treatment.