I see it.
Two words: talent
, and stress
. Public schools have very real trouble holding onto talent because the pay is limited, and the job contains a lot of stress. The stress comes from many sources: long hours, lack of administrative support, kids with serious discipline problems and disruptive behavior, and the perception that the public and the local government are hostile (trying to cut salaries and benefits and impose harsh testing and evaluations on teachers).
With more resources it would be much easier for schools to retain talent. And it would be easier for schools to reduce the physical and mental stress on their employees. That would make for better, saner disciplinary policies and stronger, healthier instruction.
It wouldn't really be that difficult if we could just shut up the fad-peddlers and defunders long enough for the system to take a breath
and institute some rational reforms.