Is that a bad thing? I appreciate it would be a lot of work and might not be relavent for most people but it would be very useful for me (or I wouldn't have requested it).
Plus it makes a lot more sense in integrated in a cast bar mod than a unit frame like pitbull since the point of these mods is for spell cancelling.
I think the reason people aren't receptive is that your suggestion would remove one of the main advantages of Quarts,namely that it doesn't have to do much behind the scenes. It doesn't do any combat log parsing; it doesn't communicate with other party members; it doesn't monitor everybody's health; it doesn't even maintain any list of spells or spell effects. It just uses the information that the new API provides to pop up some timers. To integrate all the things that your other add-on does would remove that advantage. It would also be a lot of work.
Btw, although it may not seem like a categorical fit, add-ons like pitbull already do all the processing.