What do you care about? That the tradition prevents me from understanding Kant as he would have been understood in the 18th century I think is a very charitable way to look at it, and maybe we always should read charitably, even where the author doesn't deserve it, to make our criticisms as effective as possible.
But I don't think I actually
believe it. Kant's comments, for example, on Locke and Berkeley seem to be outright misinformed – he either did not know, or was lying about, what Berkeley actually thought, and his case that he is doing something Locke has not with his notion of the thing-in-itself as opposed to Lockean substance is simply not convincing. The idea that the project of critiquing reason to find its limitations, and the panic over 'destroying metaphysics' in the process, etc. were things that Locke already accomplished, so far as I can tell. Maybe the German readership just wasn't familiar with these British developments? Locke's insistence that all things come form experience mirrors Kant's that all things begin in experience: and Locke's insistence on the shape of the mind forming the sorts of concepts one is capable of acquiring mirror Kant's discussion of the forms of intuition and thought. The thing-in-itself is then simply the Lockean 'I know not which,' which, well.
So my question is: if Kant seems on the face of it to be so ignorant of his
own tradition, to which he is directly responding, why am I then to trust him to know what he's doing down the line? It may be of some use to treat such philosophers as if they were better reasoners than they actually were, to make the tradition less embarrassing. But whether they actually were good reasoners is another matter.
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One way of thinking about what I'm saying is that your reading of philosophy may be more fruitful if you do
not approach a text with the presupposition that its author is a genius, as we're generally taught.