On the subject of QFE, it's not the air traffickers that want to retain it, rather the 2 winged master race in 22 Gp.
During my time instructing at CATCS I do not recall any failed FC being given a second chance as an air trafficker; as a general rule, if you do not have the aptitude to get them together then the same applies to accurately keeping them apart. Then there is all that stuff about coping with multiple inputs, allocation of priorites, etc, etc, skills which apply to both disciplines