AFAIK, Microsoft maintains a whitelist of common fonts that must be handled specially, that is, where the default settings for backwards compatibility don't work correctly. Essentially, the Infinality stuff does something similar. If a font is not contained in the whitelist we simply have to trust that it does the right thing.
It just occurred to me that a list of "legacy fonts" like Arial and DejaVu * might actually be a good idea, but not for toggling compatibility hacks -- instead for routing these fonts through the autohinter e.g. when in light mode.
Although the common TrueType hinting practice of clamping stems to integers horizontally is not really compatible with the softer look of the autohinter and the CFF grid fitter, so I'm second-guessing if I actually want native TT hinting to be part of light mode. Hrrmm.
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