[mrob]

Text legibility is paramount, not rendering quality. Monochrome bitmap fonts are extremely legible once you're used to them, and they don't need 4K displays. Vector fonts with high-quality hinting and antialiasing disabled are almost as good.

[bitwize]

It costs almost nothing to your GPU to render fonts in high quality with subpixel antialiasing. Especially when you can cache the rendered glyphs in a texture for reuse.

[mrob]

It costs you sharpness.