Ok, I gotta take exception here because you clearly don't understand what carriers like ANA and LH do.

After an astronaut-style interview process the LH or ANA new hire spends 24 months getting trained to company standards. With full pay, benefits and as a member of the respective union.

Even the training at those carriers is governed to some extent by their respective versions of the PWA.

The student does sign a training bond that comes due if the student elects to leave the company and use the training for employment at other carriers.

Traing new-hire Delta pilots from scratch is a great idea if the trainee is in-fact a Delta employee and compensated as such. This type of training is no different than what armed forces do with their flying branches with flying that is far more risky and variable than scheduled airline service. It can be done and done well with good results but it takes time. This type of training cannot be done in under 24 months to the line without compromising the end result.

ANA and LH aren't puppy mills but professional companies that actually pay their employees well, to learn high-level-skills the company needs.

If Delta were pursuing that model of MPL, I would be 100% behind it.

Cheers
George

P.S.: If in your mind training pilots ab-initio = puppy mill, then every flying program of our military is a puppy mill.
On your next trip with an ex-AF guy, maybe you can call the AF academy a puppy mill see how that goes over ;-)