Hi Elk, and thanks for the welcome. Yes, I am new here, and have recently–over the last six months–acquired an entire stable of PS Audio products. One after another.
I can’t say whether program-track is common on high-end players. Likewise, I couldn’t guess the purpose for which most people use program-track. I, however, use it for musical pieces that have more than one movement: symphonic, for example, but also partitas, trios, sonatas, program pieces, etc, and of course jazz compositions, etc. Opera acts and scenes. A single disc might contain several musical pieces. Typically the disc will have a longer silent space between complete pieces, and if you are attentive then you might catch it. However, more modern pieces don’t always end with a climactic crescendo marking the end, and the prolonged silence might indicate the end of the piece or it might merely indicate an extended transition to the next movement. Regardless of those considerations, it is also sometimes nice for the machine to stop itself at the end of the piece, and to enjoy the silent decay of the music in the air without the disruption of the next piece beginning after five seconds, or the disruption of needing to grab around for the remote. (Especially if I’m listening with headphones in a different room.) But that’s just how I listen. Personally I would enjoy a program-track function.