I experienced only incremental changes for around twenty years building a number of systems. At one point I assumed this was how things would be far into future. Then things suddenly changed with the addition of some rather peripheral equipment, its like I passed this THRESHOLD of mere audio reproduction to performers in room sound quality. This happened perhaps three years ago, additions since then have only increased sensation of living breathing performers in room.
So, only incremental improvements for vast majority of time, passing this threshold has been of inestimable value. It goes beyond a logical analysis into realm of the emotional. A deeper connection to the music and performers has great, great value.