As a data point, at my company it's SOP to initially enter zero wind, if there's a headwind, for both TO and landing. (And then re-enter with a headwind if the zero numbers don't give required performance.) And it's recommended technique, if there's any tailwind, to enter a 10 knot direct tailwind (our max) in case there's a last-minute increase. (And, again, later walk it back if needed)