Here's the thing about coding in general. At least in Primary through Middle Years, it tends not to be a subject unto itself, rather a kind of
"Curricular glue". "Coding" , or as it probably should be called, Compitational Thinking is more about problem solving, logical thinking, Fullan's 6Cs. Yes, it can & sometimes does use erobotics, i/o devices, programming tools etc... but these are employeed to solve problems, communicate ideas, collaborate within the context of another or multiple curricluar areas. Hence "curricular glue".  Coding implented in this fashion tends not to take time away from the curricular course work, but rather enhances the learning within that coursework by increasing the engagement.  

The STEM push can similar in nature depending on how it is being implemented.