There is a plausible argument that certain animal shapes are optimal for certain functions, so an industrialized civilization would likely have evolved to resem

There is a plausible argument that certain animal shapes are optimal for certain functions, so an industrialized civilization would likely have evolved to resemble us anatomically (especially the arms with opposable thumbs bit). They probably even used this argument in Star Trek. But the real reason ST aliens just look like humans with latex glued on their faces is because it started out as a low-budget show and that's the easiest way to make aliens. In reality, there's no way for us to test this theory without actually meeting some alien lifeforms.