A healthy ecosystem should allow for innovations to take place from Apple, Google, and Mozilla and look at what sticks. As it stands now, Mozilla and Apple occasionally make new contributions to web standards but anything that chrome pushes effectively becomes one without any input from another company and that's kind of problematic.
So it's Chrome that doesn't implement a standard, and Safari that doesn't implement an ad-hoc competitor technology.
Why should they? It was a thing pushed and created by Google.
We might as well just have Chronium then it Google's whims become de facto/jure web standards implemented by all...
Google Chrome was compared to IE6 as being close to having 'the monopoly position as a browser'.
Indeed, Internet Explorer peaked at ~95% global browser market share in 2003-4 (when IE6 was the dominant version). Safari currently has <10% of the browser market share on desktop, <20% including mobile [1].
Sorry, Safari is nowhere close to being IE6 from this perspective.
[1] https://en.wikipedia.org/wiki/Usage_share_of_web_browsers
Btw, I’m a web dev myself.