[myself248]

Yup, I do this myself just to reduce the number of parts I stock.

I'll try to plan uses for all the pins in advance, like a deluxe version, and then cut down what's needed for the thing I'm doing now. Often I can actually add something useful (like an extra copy of a signal to reduce the need to splice in the harness) at no cost, just by thinking ahead a little.

Another thing I'm proud of recently, is having an uncommitted relay on a board, whose function could then be defined by how the harness was wired. Rather than try to anticipate how it would be used, I just figured it'd be handy. Provided an extra ground too, so you could just put a hairpin wire in the connector to ground one side of the relay since that's a pretty common usage model. And for builds where we knew we wouldn't use it, just DNP at assembly time.