@munificent well put!
(another element of meaning, other than time, might be “vulnerability”: in the sense that all craft is rehearsal for later work, making something for someone else gives them a marker of where you were and how you thought about that craft. Which can be scary! You put a piece of a version of yourself into the work— as you were when you made that work — and you trust the receiver will value that piece, just as it reflects how you value them.)