Crossbows for use against armor were heavy, if still handheld, weapons, like the arbalists' bows in TW2. You need tremendous draw force to do much worse than tickle an enemy wearing plate, and a substantial instrument to store and release that force. To use it in battle, you need supply and support. This kind of weapon is not something a witcher who travels light would use.
A hunter's crossbow capable of bringing down soft targets, being drawn and fired from horseback, carried over long distances, etc. is a weapon of very different qualities.
A hunter's crossbow capable of bringing down soft targets, being drawn and fired from horseback, carried over long distances, etc. is a weapon of very different qualities.