to 
differences in quality of training is all to do with what we reward for PIs and students: if we reward better training (beyond how many students they graduated), PIs will do a better job regardless of number of students in the lab. Social aspects can be achieved at the dept!
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None of the examples are clearly system. What is system is how to attach punishments to these professor failings. And that is advancing. Too slowly. But it is. But systems of punishments are complicated.
also, I’m curious to learn, when you engage in depth in debates like this, how often do you come out depressed? 
Are there many organised campaign groups within academia protesting for change? We’ve had lecturers strike in the U.K., there’s been a lot of successful negotiations. You’re right; there needs to be clear goals and it must be well organised.https://www.theguardian.com/education/2019/nov/07/university-staff-dont-want-to-strike-for-fair-pensions-and-pay-but-were-being-forced-to …
