I'm designing a modular board, where the two modules are connected through pin headers. For mechanical stability I have more pins than traces and my question is that which is the better: route each trace through one pin and leave the remaining pins free or route the traces through multiple pins?
In the case of power traces (e.g. ground) I think it shouldn't be a problem, but what about high frequency signals (e.g. gate drive signal)? Does splitting them on the pin header cause any problem (noise, signal integrity, EMI, etc.)?