The premise of Someone's hypothetical was to explain to theon144 why it might be both hard and important to guess. The hypothetical assumed that the difference already existed. It echos the larger context of Han unification that com2kid started, but with an example that's a lot easier for native English speakers to understand.
So while I agree that they haven't yet diverged, that's outside the context of the hypothetical, where they have diverged.
That's wrong. Someone's hypothetical had no diverging meaning involved, only a stylistic choice in the presentation of the same letter.
And he is still wrong when it comes to the claimed necessity to "guess".
The user has set up his system correctly. "Guessing" only comes into play if you want to force your stylistic variation on others.
And that is obviously a bad idea, for all the reasons called out before, like familiarity and readability.
Let's not kid ourselves. When it comes to Han unification opposition there is mostly one issue at play: plain racism. "Our holy script shall not be defiled by those dirty bastards". And that works in all directions.
We don't give out code points to speculative future developments.
If and when they diverge one will get its very own code point.