I’ve had customers request complete rebuilds of functionalities several times over, destroying weeks of effort each time… and I’ve never cared, as long I’ve clearly communicated my concerns beforehand.

I’m precious about the code only while developing it. The process is the fulfilling part to me, not how the end result is used. The approach has its drawbacks, I’m sure, but I find it very easy to not grieve over paid-for-but-unused work.