> [...] I also think nothing beats a well hinted font @9 points on a
> full-HD laptop screen which are still plenty around?
For my old eyes, this is too crisp, too much contrast. I much prefer
anti-aliased subpixel hinting. It's also more 'natural', that is, you
need less distortion from the real glyph shapes and advance widths.
Below 12ppem, essentially *all* fonts, whether they are serif or
sans-serif, look exactly the same – there are simply not enough
possibilities to position the pixels differently and still maintain
legibility. You might simply use a single bitmap font instead.
Werner