You are quite correct that the new guys/gals are as capable as any of the staff......
Disagree!
That's like saying that a newly qualified car driver would be able to cope with abnormal situations as well as a driver who'd held a Driving Licence for decades.
Common sense tells us that the experienced driver would, over a range of situations, measuring the overall average performance, cope better. He/she might rescue a situation and avoid an accident which the newly qualified driver would'nt. The experienced driver might even anticipate a problem and avoid it altogether, whilst the newly qualified would sail into the situation, blissfully unaware.
Hence my argument that high pilot turnover is bad news.
It's common sense, lets face it.
It's also what I've observed to be true, without question, based upon decades of watching it go on from the sharp end.
PS -- I've no doubt, whatsoever, that you could twist my analogy in order to suit your own particular viewpoint,
but you ain't fooling most of the people reading this thread.
Experience counts!