Honest opinion on why someone might have an issue or believe this:
1) Many systems have the ECU mounted on the carb flange but yet most electronics are only rated for about 105C or 221F while operating. So they could easily get on the ragged edge there, as well as the vibration from that location. Get one with an external ECU and mount it inside the car and you won't have issues.
2) Most people don't want to do the stuff to do the most reliable type of fuel system (return system w/bypass regulator and in tank pump).
3) Many people just aren't willing to spend the time or money to make good connections to the existing vehicle (weatherpack connectors with proper crimper, solder/heat shrink, etc)
4) Not knowing how to tune it, but you have the same issue with a carb. Self tuning only goes so far.
I won't ever have to replace an accellerator pump, power valve, distributor cap & rotor or anything like that again. So I mean there's generally less that can get eaten up by fuel over time, though I still have the fuel pressure regulator.
