I think what they really want to prevent happening is people using the parser in regular duty finder content to harass people. It may not become a widespread problem but I can definitely see people starting up Expert roulette and then hounding someone because their numbers a just shy of what they should be in a savage raid. Most of the game can be cleared without trouble without having to max out gear and rotation, but an ingame parser can lead to the idea that your numbers must be raid tier all the time no exception. And just look at how the raid community attacks each other with their parses already.