I didn't talk about WCW. But you're wrong about the WWF.
I said that aside from Bulldog, he never lost cleanly. Let's check it:
He didn't lose clean to the Mountie. According to the storyline, he had a 120 degrees fever, and the Mountie used water and his cattle prod. NOT a clean victory (But who cares? It's the fucking Mountie).
And about Shawn- He didn't lose cleanly there as well. Remember the overtime? Remember that he used it as an excuse later? Imagine something like this happening today.
That was part of Brets gimmick for his heel turn, to use excuses.
But his loss to Shawn was as clean as can be. Overtime or no overtime, Shawn beat Bret in the middle of the ring after two Superkicks, no outside interference, no gimmicks, nothing.
Same with Mountie, whether Bret was sick or not, he was pinned clean by Mountie. What's with the water and his cattle prod? I don't remember any of that during that match.
I get what you're saying though. His losses were always in a way to protect him. But that's wrestling booking 101, to protect the babyface. If you don't count these examples as clean jobs, then no babyface in history has ever lost clean.
Even Rock putting over Lesnar, which is considered a passing of the torch deal, was booked in a way to protect Rock with all the Heyman interference and Rocks injured ribs.