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"even though the trait isn't necessarily evolutionary beneficial for the organism."

If the trait is negative, it will be selected out of the population. It's only if it's beneficial, or neutral, that that it will spread. What's particularly special about gene drive, is that it drives itself onto 100% of progeny, rather than the 50% expected by traditional mendellian genetics.

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If the trait is completely neutral it will double every generation (until saturation is setting in). If the trait is like 10% negative then it will instead increase by a factor of 0.9*2 = 1.8, which is still pretty quick.

Only if it is extremely negative, by more than halving amount of offspring, will it be selected out.

That's in the short term. Presumably, some sort of resistance would evolve in the long term.

These are all absurdly idealized models of actual population genetics. No trait is truly neutral.

At the very least, this experimentation is likely to show some interesting real-world population genetics that we can measure.

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