General concensus, that I've come across, in UK is that improved climb is only used to increase MTOW if required. It is not used to obtain extra tanking fuel etc. etc.
I was taught that taking the 'top end' off the temp. was what mattered with engine life. Taking further dribbles off will do nothing other than make life difficult. It would possibly increase cost by asking the performance suppliers to provide the extra data in what they would consider to be a non-standard application.
It seems to go against the valuable KISS principle.