The Yu Gothic body is not only slender to thin, but because the gamma correction is doubly or triple layered, the gray is becoming brighter than originally. If gamma correction is inverted, it will be normal display.
What I would like to pay attention to is not just that the letters are thin, but the density is different depending on the line. Compared to kana with many curves, Kanji with more straight lines along the pixel appears black.
Also, the blurring of characters is different depending on the application. For example, the next image is the one with the same weight and the same number of points, using Firefox and Notepad respectively.
In Windows font rendering, gamma correction is doubled, triplicated Windowsのフォントレンダリングは、ガンマ補正が2重、3重に掛かっている
Probably gamma correction is done also in Windows font rendering, but somehow gamma correction seems to be multiplying. In other words, gray becomes too bright because of repeated processing to brighten gray. (Rgb (128, 128, 128) should be corrected to rgb (188, 188, 188), which is rgb (223, 223, 223) or rgb (240, 240, 240).
It is because the Gothic thin font should originally be displayed with this degree of blackness, it is not too thin, it is too thin to read. It becomes readable if you thicken it is that there are few gray areas, it is misunderstood that the gamma correction is not appropriate, and Windows font rendering is not appropriate. In the future I would like you to improve gamma correction so that small letters can be properly displayed without irregularities.