RE: “*why* this isn’t more widespread as a generic technique”.
Possibly because I don’t think the museums world has time to find out about all the new-wiz-bang technologies (unless you are a larger org or an electronicmuseum;). And there doesn’t seem to be (and I may be wrong here) an overriding collaborative effort to share relevant technologies. Shouldn’t the efforts of larger organisations be filtering down to the smaller ones?

Generally its very good to see examples of how things actually work in the real world, and then for tools to be provided so those examples can be repeated be those less technical – does this currently happen in museum land? (& I’m talking as an ousider here).