Anarcho-primitivism is a discrete variant of the overarching conservative phenomenon: when an-prims go say "go back" they mean a specific and particularly reactionary set of social transformations. This doesn't mean that ordinary conservatives don't desire social regression; it just makes them not as openly reactionary as the most reactionary social conservatives.

You're right, of course: any short and pithy summary of an ideology is going to have gaps. American conservatism is "funny" in the sense that it admits of additional gaps: there is a significant (although continually diminishing) population of "purely fiscal" conservatives who have dominated American intellectual conservatism, for example. And this is true for progressive movements as well, particular in the context of labor.