The PO should try to balance this with feature impementation and the team + SM should make it clear when it's needed. This seems to work fine in an environment based on collaboration between PO,SM and dev team, but will probably fail in an adversarial one.
I have rarely seen a PO as the single contact to the "business". Most of the time there are multiple project managers, product mangers and line managers who have a say and put pressure on the dev team.
Because managers have to report to other managers and they don't want to report that the devs are working on something that already has been implemented and "works".
The PO should try to balance this with feature impementation and the team + SM should make it clear when it's needed. This seems to work fine in an environment based on collaboration between PO,SM and dev team, but will probably fail in an adversarial one.