The first problem is hard to quantify. It is a designer’s call what “too many responsibilities” is (well, only until we see it in code, then it will be more apparent). If you were to say “one responsibility per module”, you would often end up with a plethora of small modules. Such a situation increases the cognitive load of the design. The same will happen if you assign too many responsibilities to each module. Of course, the High Cohesion pattern is something that will come in handy here.
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That’s another well established pattern in Modular Design. It’s about putting together code that is highly related to each other and by implication separating unrelated code into other modules. High Cohesion discourages spreading the knowledge (e.g. of particular logic) among many modules, because it increases complexity and cognitive load. It’s easier to reason about the code that is closer to each other than scattered throughout the system (coupling inside the module is not such a problem).