The main problem with flowcharts for programming is that flowcharts are procedural, whereas much of what we do in programming is declarative: the flowchart desc

The main problem with flowcharts for programming is that flowcharts are procedural, whereas much of what we do in programming is declarative: the flowchart describes more how to do something than what has to be done (at some level). Of course, this depends on at which level the flowchart is drawn.