Some waste is the cost of resiliency. But with phones (and other electronics and appliances), we're talking about extreme amounts of waste. Way more than is needed to keep around and develop the capacity and know-how.
> Especially from a feedback perspective from consumers?
What feedback? Unless they screw things really badly, they're just listening to the echoes of their own marketing departments. This is a supply-driven market with high natural barriers to entry. Customers buy what they're told to, and are happy about it as they're told to.