[Tom4784]

As for Virtue signalling, it is a thing but the wrong people often try to claim it. A straight person can't claim virtue signalling towards gay people for example, and Dumbledore being gay was an example of Virtue signalling since it hasn't to date actually been mentioned or come to light in any official works. If it actually played a part or was spotlighted than it would be different but it's not. Grindelwald was his friend in the books and in the Fantastic Beasts films and the only thing that states otherwise isn't present in either works.

As for the Hermione thing, it's often said that the stage is colourblind and while her attempts to make out that Hermione was potentially always black in the books was misguided as it's easy enough to see that's not the case, it's one instance that JK almost had the right of it. Hermione can be played by any race because her race isn't a defining part of her character.