Because Nigel Airways, who have heavens knows how many full Flight Simulators up at Branecrank, could clean up quite nicely 'marketing' a 'product' for other airlines - and they wouldn't have to go to the expense of training any real pilots, just simulator drivers. So they are quite keen on this barking idea.
Personally I think that a proper aptitude and selection process, followed by the current VFR CPL is the absolute minimum non-synthetic flight training which should ever be allowed. But perhaps conducting all the IR and multi-engine training in an appropriate jet FNPT and/or FS might have more relevance than the current farce of struggling to keep a Sennapod flying on one labouring engine following a SEFATO in pretend IMC!
But leave it as it is - and make the airlines pay to train their own pilots would be my preference
