This text looks okay to me even if I manually adjust the gamma to approximate doing antialiasing/compositing in linear space. It’s on the thinner side, but plenty readable.
Which platform has “correct” font “blending” (and what do you mean by “blending”)? I have not yet heard of one which does antialiasing or compositing of fonts or other vector graphics in linear (vs. gamma-adjusted) space. The font hinting / antialiasing on Windows is super ugly. Linux varies a lot from one machine to the next and a long history of various font problems.
Maybe what you meant was “looks OK on the Mac with more-correct-than-usual font blending, and looks terrible on X other platform”?
More likely what you meant was “looks OK on a Mac with a high-resolution display (typical of recent Macs), but is harder to read on a lower-resolution display (still common among budget PCs).”
