If you look at the Unicode identifiers RFC's discussion[2] you'll see the steps ...

If you look at the Unicode identifiers RFC's discussion[2] you'll see the steps we're taking to address and mitigate that and other problems. That being said if you look at the tracking issue[3] you would also see that we haven't had the man power to fully implement this feature, which is why it will remain opt-in, nightly only for the medium term.