For an airline such as BA, L3 are absolutely and undoubtedly a sub-optimal solution to the training requirement. Any change from the status quo, represents a quantum leap (downwards!) in quality!
However, what they are, is cheaper than BA’s in-house training.
In this day and age, what more do you need to know?
Please feel free to imagine the ultimate result of such a (so far hypothetical!) move?
Who has a scooby whether this has anything whatsoever to do with the bizarre musings of the OP??