Waxing philosophical for second or so on the occasion of my 70th birthday (born 12/25/52) I’m pretty sure there’s no such thing as “sitting pat on what we know.” Lots of great answers here to this fair question. With so many new artists, remasters and great recordings available to stream, the driver behind more convenient and higher quality delivery is strong. Demand drives innovation and resistance to learning about new stuff is self defeating for people who enjoy HiFi. In the last couple months my enjoyment has flourished by digging around the theory behind the big baffle revival in speakers, the importance of stacking the gain in your audio chain cleverly and, most recently, a wave of low cost wireless streamers with high quality chips!