P2F or cadet program's are not a problem if well managed with proper systems in place.
The problems arise when airlines cut corners in training for inexperienced pilots.
I would guess that the airlines that cut wages/employments costs are probably the same airlines that cut costs in other safety related areas.
I came through a general aviation background to end up in a major airline. The airline had cadet program's for many years & were able to select the best available candidates and give the best available training. The end product (cadet pilots) were generally excellent.
I have worked with other airlines that cut costs where ever possible & the end product (cadet pilots) are questionable at best. Fortunately, most of the Captains come from old school backgrounds & can keep the blue side up.