Not an expert at all but from skimming Wikipedia “The appearance of plate tectonics on terrestrial planets is related to planetary mass, with more massive plan

Not an expert at all but from skimming Wikipedia “The appearance of plate tectonics on terrestrial planets is related to planetary mass, with more massive planets than Earth expected to exhibit plate tectonics. Earth may be a borderline case, owing its tectonic activity to abundant water” https://en.m.wikipedia.org/wiki/Plate_tectonics https://en.m.wikipedia.org/wiki/Plate_tectonics It is just that there no objects in the solar system big enough to have plate tectonics. And we currently have no way of detecting them on exoplanets.