There is absolutely still a host of problems like this and no, there are still many inefficiencies waiting to be poached. Often these are internal, sometimes h

There is absolutely still a host of problems like this and no, there are still many inefficiencies waiting to be poached. Often these are internal, sometimes highly customer-specific products though. In many cases writing a simple interface between two existing components unfortunately won't do because these components were either never meant to have external interfaces in the first place or the original programmers aren't available anymore and nobody really knows how to change these components. So, your only option is rebuilding the whole system from scratch, which is no easy undertaking, given that these kinds of systems often have accumulated decades worth of knowledge and business logic.