It is an additional, unnecessary factor to be managed on the approach with no safety gain. It means that there will be more unstable approaches with their consequent dangers but with no great benefit. There will be additional noise generated and the approaches will be less efficient and will burn more fuel so less environmentally friendly. None of which would be an issue if there was a performance issue that needed to be addressed like at Marseilles or Naples. However, the only reason here is to appease people that have made the choice to live near an major airport. The noise levels have reduced significantly since the 80s and we didn't do steep approaches then for noise abatement. This is all about politics and reason or sense will have no input to the argument. I suspect the decision has already been made and now we are having a trial to prove the case, i.e. the trial will be deemed to be a success or failure or whatever it is intended to be irrespective of the data.