LOL, that question is like, Do you need to wear a seat belt when in a light plane?
As I said, plug-in units are tuned to a base set of settings. Nothing too smart going on. If you have a sturdy and reliable motor to begin with that is already making more neddies, then and ECU that can take advantage will help. Most interceptor chips suggest basics like Zorst, intake mods to get something worthwhile.
When custom tuning, have all your ducks in a row then pull the trigger.