Earlier quoted context omitted.
I would say 1 salesperson in 20 has the ability, interest and influence to alter a product roadmap. The other 19 exist because of their competitive drive and ability to bang their head against a wall without losing enthusiasm.
In my experience 100% of salespeople will try to influence the product roadmap if it means they can sign a new deal
You can’t trust a salesperson to think about the broader good when half their comp is tied to specific deals.