Google’s suggestions don’t take the entire picture into account. They are usually focused on making more money for Google, and focused on hitting the high-level bid strategy’s target (which it perceives as the campaign’s main goal) at all costs. There can be consequences to overstretching in one area in order to hit the bid strategy target. Here is a video explaining a campaign’s “Limited by Bid” message & suggestion. The video explains why it’s best to ignore it in this case.