Then presuming you use Firefox, the only viable non-Chromium alternative that’s mature enough to fit your implicit preference, you’re surely aware there are a wide variety of things not supported in that browser too. If you’re inclined to look for patterns, you’ll find that quite a lot of them overlap with Safari—either for the same privacy-respecting reasons, or the same standards process-respecting reasons, or the same second implementation in the standardization process reasons.

It’s good that both browsers are a hindrance to Google just shipping stuff and that stuff becoming a de facto web standard. It’s even good that they have different priorities because that gives them different perspectives from which to catch mistakes before they’re almost totally irreversible.