[ethn]

Neo-Kantian generally refers to the application of the style and epistemology provided by transcendental idealism in treatment of other subjects, rather than as a departure from Kant.

The Thing-in-Itself was once controversial but undeservedly. It's necessary to prevent the subject knowing the object fully, so thus it is treated in the sense of Cassirer/Cohen's Infinitesimal. No one has trouble with Noumenon maybe only in the disappointment with the intractability of metaphysics to answers some of the most pressing questions.