Maybe what we really need is wiki documentation. The documentation has never really been ideal, as far as I am concerned, even in previous versions. This community may be a better source of documentation than anything that could be put together otherwise.
I tried reading through the Help topics, got to activegrid, wondered, “What is a grid?” and ran into a dead end. That is all too common. Currently I am looking for limitations on text lists, because I think I read about one here, and I am running into a situation where a text list is only giving me about 2/3 of the 6000+ records I am trying to go through. But the documentation on text lists and matrixes is pretty siscanty. Like “Grid”, if you look up “Matrix” or “Text List,” you get items that refer to them, but not the objects themselves. This has been a weakness in earlier versions, as well.