Web color isn't broken, it's specced weirdly. Any attempt at "fixing" this would miscolor every existing website for the sake of correctness.
The SVG color space definition is the exception here, browsers can do better in that area. Still, it's silly to expect browsers to change the way their color system works and go against the expectations of color blending for web developers just to tick a correctness box.
Make a time machine and take it up with Microsoft en Mozilla in the early 2000s if you want the default color system to work differently. Write a patch for Chrome/Firefox/WebKit to implement the SVG spec if you're so passionate about this. People generally don't care about this stuff, they want the result to look Good Enough™ and that's exactly what the current implementation does. I don't think any browser maker will put in the effort to do much about this "problem".
The SVG color space definition is the exception here, browsers can do better in that area. Still, it's silly to expect browsers to change the way their color system works and go against the expectations of color blending for web developers just to tick a correctness box.
Make a time machine and take it up with Microsoft en Mozilla in the early 2000s if you want the default color system to work differently. Write a patch for Chrome/Firefox/WebKit to implement the SVG spec if you're so passionate about this. People generally don't care about this stuff, they want the result to look Good Enough™ and that's exactly what the current implementation does. I don't think any browser maker will put in the effort to do much about this "problem".