It is still a larger attack surface. A salesperson can give a false impression about the value of the ongoing relationship over the transaction and make a ~promise that is not legally binding.

I.e. if you give the actual date you need something they may say they talked to a friend in logistics and they have it on good authority that it really should be here by then. Getting their offer with no indication of your requirements means any misrepresentations aren't tuned to your specific requirements.