Tuning devices give you the ability to destroy a perfectly good motor with a simple misunderstanding.
Because of that, in my opinion, 90% of people have no business messing them. You can be certain, if there is a way to **** it up, someone will.
If a USB cord, and following 6 steps, is too much for someone in 2016, I don't even know what to say, it's literally easier than cooking spaghetti, changing oil, or installing their new slip on / header.
For that individual, total electronic illiterate, I'd ask them to mail me their ECU and ash it for them. Least chance of complications for the businessman involved.