In a world that's getting increasingly complex, I think that sites willing to track information from a variety of sources are invaluable. I also find it annoying when individual sites limit access to information consolidation sites. While I don't have enough of these sorts of things to need the sites you mentioned, I do use TripTracker to keep track of flights, hotels and such. WN have decided to disallow access for "security" reasons, even though the information is read only. That's completely annoying. Fortunately, AA still allow access.

I can see how people who want to use the aggregation sites would be equally pissed off about such a decision.

Cheers.