Also, the test is about a shortage of believable positive portrayals. Whether or not it's easy to do is beside the point.
This implies this is really any problem. I'm particularly vehement of this test in that the mentality that gives it life demands mass produced gloop in the vain hopes that something marketable will rise, giving birth to a franchise we can latch onto and consume for generations in order to achieve the goal it seeks. Just write good books, produce good movies, sing good songs and let the rest come naturally. And if you do for whatever reason think hard and decide on a character's sexuality, gender or whatever the fuck, make sure it's only for the character's sake or it really well show.
To end that off, the number of gay villains who've been done incredibly well are all jogging my memory; Ozymandias for example is credited as one of the most god-tier villains of all time and it's an important background plot which you have to discover, it's likely one of the reasons Rorshach immediately distrusts him. If you try to impose what makes a good character from top down you're going to fall into hollywood syndrome where they draw a graph based on successful things and turn it into a formula, not letting success grow from down up independent of what's popular or appealing. 'Rules. Tests. Formulae.' Creativity breaks these boundaries, if it doesn't there is something terribly wrong.