It shouldn't be, but there's always been very healthy industry niches around pulling data from one system and putting it into another one. Nothing ever lines up

It shouldn't be, but there's always been very healthy industry niches around pulling data from one system and putting it into another one. Nothing ever lines up exactly, and there's always some idiosyncratic remapping or futzing that has to be done manually or with some one-off custom code, so it remains an expensive contract business.