And the proposed version already shows signs of being too limited. With a pixel-centered viewpoint, the results will not be reasonable on Apple Retina displays

And the proposed version already shows signs of being too limited. With a pixel-centered viewpoint, the results will not be reasonable on Apple Retina displays, for example, or when printed. On the other hand, anything vector-based would also become complicated pretty quickly, especially for platforms that may still have APIs that are natively pixel-based. This is not something that can be standardized easily. Besides, there are parts of even the current standard that are broken enough to demand some replacements and deprecations. For example, "std::string" and "std::iostream" are pretty awkwardly implemented and it would be really nice to have something better.