It is what makes all the difference here.
Many features that are a Web Standard are unsupported on iOS precisely because Apple refuses to allow alternative engines because they don't want those features on their platform (mostly to favor native apps under the pretext of security, like if Google is not capable of making a secure browser, at least as secure as Safari).
Chrome and Firefox on iOS are not the same Chrome and iOS that run on all the other platforms, they are basically Safari.
It does matters.