Comment by lparry

And now your frontenders need to know how to write code in whatever your backend is written in, lest every new change be bottlenecked waiting for someone to build them new endpoints. Also, your backend guys are tied up constantly doing stupid endpoint changes, and both teams are wasting time messing around with extra effort to allow one side to be deployed before the other, instead of working on actual functionality work. Doing this in REST is a genuinely unpleasant experience, well deserving of being called hacky