An irrelevant but interesting take is that this applies as an analogue to a lot of stuff in electronics related space.

• It is harder to receive data than to transmit it, because you need to do things like:
  • match your receiver's frequency with that of the transmission (which might be minutely different from the agreed upon frequency), to understand it
  • know how long the data will be, before feeding into digital variables, or you might combine multiple messages or leave out some stuff without realising
• this gets even harder when it is wireless, because now, you have noise, which is often, valid communication among other devices

Getting back to code, you now need to get in the same "wavelength" as the one who wrote the code, at the time they wrote the code.