Hello! From a PMM perspective, Sales input is critical to a successful SE strategy. They know the needs of their team so they can help SE prioritize and focus. Usually finding a partner in Sales leadership can help you avoid too many cooks in the kitchen and streamline feedback.
Where SE can add value is providing strategy on delivery (role play, compeition, certifications, etc.), structure, and content. The size of your company and enablement team also differentiates how much effort you can you play as well. Growing companies and larger sales teams will need more enablement and guidance - whereas in smaller companies, the sales team will be doing more scrappy and do things on their own.
Where PMM plays a role is content and helps prioritize initiatives in the level of importance (narrative, competitor, product training, etc.).