Gamma correction is the most important aspect of font rendering. And GDI passes it perfectly. DirectWrite fails gamma more often than not. That's why reading text in DirectWrite is extremely infuriating. I mean, I don't have eyesight issues that prevent me from reading DirectWrited text, but I absolutely can't help but to notice incorrect gamma and I despise any incorrect gamma text.
I don't use the latest versions of Mozilla Firefox and Chromium as the text rendering is a dealbreaker.
I'm looking for a way to permanently delete DirectWrite from Windows 10.
Edit: Here's a comparison showing renderings of both ClearType OFF and ClearType ON, both GDI and DirectWrite, both light theme and dark theme, and arrows indicating the square that directly influences the gamma correction in the light and dark themes: