I had assumed a GRC allowed someone to amend their drivers license and passport. I suppose as it allowed someone to amend their birth certificate then it sort of did, in a non direct way.
I'm not convinced the purpose of the GRA was to allow someone to be genuinely and earnestly treated as the opposite sex and the purpose of the GRA certainly wasn't to allow trans people to deceitfully hide their sex at the expense of non consenting onlookers.
Instead the GRA allows a change to legal documentation and assumption of sex based on those changes. In reality, genuine and earnest treatment isn't dependent on the GRA holder, but instead dependent on people the GRA holder interacts with. These people are independent, sentient beings with their own opinions.
Whilst I feel trans people should not be persecuted I also feel people should not be compelled to genuinely and earnestly accept a trans person as the opposite sex.
Fortunately both these stances are protected in law. Trans people are protected from persecution and the right to have gender critical views are also protected.
So as far as I can see the GRA is as effective today as it was before the decision. No rights have changed the law has just been clarified.