Also, any length of POE run gets voltage drop, and POE switches and injectors often have tedious modal configuration based upon length of run and are designed with non-standard limitations such as maximum draw limits shared across multiple ports, which in aggregate will cause no end of issues. For verification, ask any experienced CCTV installer. These are exactly the sort of issues that cause users to take products back to their distributors.

So it's a case of "works in theory, PITA in reality, probable support and brand image impact huge, resulting priority zero".