Supplier feedback is design input, not a late surprise.

Supplier feedback should change the design when the supplier is reporting a limit of their process: a feature they cannot form, a tolerance they will not hold, a stack they cannot assemble, a lead time that makes the part fictional. It should not change the design when the comment is a habit from another job, a request to move difficulty onto you, or a suggestion that breaks a requirement the supplier was never told.

Obeying every note produces a product that is easy for one factory and wrong for the user. Refusing every note produces a tool that fights the process, and a blame argument later.