Straight wire with gain????

I should start this with a big, fat IMFO. Here goes. After reading tons of great thinking in this forum, it seems that we all want a sound as close to a live perfomance as possible. But ... First, live performances vary dramatically based on the venue. In fact, different types of music, like classical, have different kinds of concert halls build for them to provide the "right" acoustic environment. Second, from what I've read, different volume levels exhibit different perceived frequency responses, all else equal. Given those two points, how can a single system really provide the "live experience" at different volume levels for different kinds of music? Add to that the inherent problems with room acoustics. Help! Is a "straight wire with gain" analogy the correct way of thinking about audiophile design? I honestly hesitate to suggest this, but don't we need the ability to switch among "multiple wires with gain"? Can we ever be happy if we can't? In turn, does that suggest the need for acoustic adjustments (e.g., Tact, SigTech) as the ideal rather than the aberration? (By the way, I don't own any of these nor do I work in the industry). What am I missing? I'm honestly confused. Thanks.