I don't think they actually take luminance into account (although I personally like the idea); I just meant that they solve the problem of "black-on-white text looks too thin" by thickening the text, rather than messing up other parts of the pipeline.
Absolutely, and I think there's a very strong case to be made for that. One of the points I'm trying to make is that you have to solve it somewhere. People who focus narrowly on "correct gamma" often miss this, especially when "incorrect gamma" is also plausibly a workable solution.
