Usually any impact a salesperson has over the product roadmap is too slow to have any impact on the sales opportunity.
Salespeople usually have more influence on the customers than on the roadmap, so they're better of trying to influence the decision making of the customer, than the product.
Salespeople focus on their sales targets, trying to change a product roadmap is not a very effective way to reach short term targets.
Obviously, a product manager should reach out to sales to try and understand their perspective on the product and the customer needs.
Depends on the company. I worked for a small company that was a real clown show. Sales would come down to the engineering area and say things like "I just closed a huuuuuuge sale for the company. We need a product that does A, B, and C, now so we can deliver it!" And, that became engineering's scope for the next 4 weeks...
Salespeople usually have more influence on the customers than on the roadmap, so they're better of trying to influence the decision making of the customer, than the product.
Salespeople focus on their sales targets, trying to change a product roadmap is not a very effective way to reach short term targets.
Obviously, a product manager should reach out to sales to try and understand their perspective on the product and the customer needs.