As with most things Kantian, I think the ‘Kantian Gloom-Watch’ section might be improved by a Hegelian supplement. So, here’s Hegel sticking the boot in:
The esoteric teaching of the Kantian philosophy — that the understanding ought not to go beyond experience, else the cognitive faculty will become a theoretical reason which by itself generates nothing but fancies of the brain — this was a justification from a philosophical quarter for the renunciation of speculative thought. In support of this popular teaching came the cry of modern educationists that the needs of the time demanded attention to immediate requirements, that just as experience was the primary factor for knowledge, so for skill in public and private life, practice and practical training generally were essential and alone necessary, theoretical insight being harmful even. Philosophy and ordinary common sense thus co-operating to bring about the downfall of metaphysics, there was seen the strange spectacle of a cultured nation without a metaphysics — like a temple richly ornamented in other respects without a holy of holies.
Hegel, Science of Logic, 25-6