Is This a Limitation of Our Ability to Find Earthlike Planets?

The Kepler mission found six planets in the habitable zone. It didn't find as many as we expected, and that's just because these really, really small planets cause such small transit depths Because they block so little of their star's light. Those types of stars are among the most common types of stars in our galaxy,. But those are also very faint. And that brings us back to the whole we know faint stars will have a lot of noisiness nelit curves, so it challenges the identification of small planets.