Outsider take-

Don't we take on enough liability and career risks as pilots without volunteering for jobs we are not trained or insured to do? Maybe we should have the FAs help out up front while we push wheelchairs around- maybe they can get the APU up and running and bussed up and get the packs configured for the passengers. Let's all just do each other's jobs! What could go wrong!

Don't throw bags. Don't push chairs. Protect your careers.