You're somehow conflating learning the history of your own field to being self-obsessed. Almost all of social science and humanities education starts with a history introduction - the origin of ideas, the development of the field, etc. Is literature self-obsessed too, because they read Homer? Your analogy with phlogiston completely fails, and not just for that, but because revisiting ancient philosophical ideas is not the same as reconsidering outdated scientific theories. Your source of misunderstanding is captured in your criticism that philosophers are incapable of
>abandoning philosophies long disproved
If you think philosophy can be proved or disproved, then you don't get it. Philosophy produces arguments, and some of those may be stronger than others, but there is very little in philosophy with unanimous agreement. I think _your_ ignorance, ironically, is what makes you believe that certain ideas are ignorant. For example, here you say that philosophers
>can't teach you about Descartes' epistemology without also getting into his ignorant dualism
I say this as a non-dualist - the debate on the philosophy of mind is far from "proved" or "disproved", and moreover your suggestion that Descartes' dualism should somehow be removed from the curriculum is ridiculous. The point is that philosophy students have the opportunity to debate and think about this stuff, rather than just accepting it as dogma. So even if we were to reject an idea entirely we'd still teach it to new students. (Not to mention that separating Descartes' epistemology from his metaphysics would be a terrible pedagogical idea.)
But what's even more bizarre about your comment is that all of this is pretty much irrelevant because in actual philosophy education and literature today the kind of ancient ideas you're attacking are never the core stuff. They might be used as intro or historical material but you're exaggerating the extent to which they take up the curriculum. The whole thing is a strawman to be honest from someone who I doubt has ever studied philosophy in a university.
To go on, the people attacking philosophy have tended to ignore history. Historically, many topics started out as curiosities of philosophers in academia before branching out into their own areas/departments. (Today's scientists would have all been natural philosophers far back in history, as I recall.) I think the original subjects could be typified as religion, math, and philosophy. It's going to be easy to say philosophy is worthless if you're neglecting the contributions to knowledge it's made in the past through branching off whole areas of study. It's like removing all the fruit from a tree and then saying the tree is useless because there's no fruit on it. It's worse, of course, since without a theory of why things are done or reasoned or calculated the way they are then disciplines like engineering or statistics (for instance) reduce to theory-less plug-and-chug. Enter the world of p-value hacking and other poor, faulty applications of routine sans underlying reasoning.
As long as there has been philosophy, there has been sophistry. The adversarial use of bad (but very convincing) arguments was a problem in ancient Athens, and it's a problem today. If you can't even find the fault in an argument made in good faith, you're absolutely helpless when the faults are made in bad faith.
As a former philosophy major and almost math major (ended up taking the minor), I think it would be a good thing if more people were exposed to history of math and philosophy of math, especially in STEM. This is for two reasons (1) too few STEM students are exposed to the historical situatedness of mathematics and alternative constructions to the standard ones and (2) a lot of topics in the history of math provide way more fun terrain for learning to read and write proofs than the stuff that kids in secondary or primary school are exposed to.
And to revisit this:
> When you take a math class you don't spend time learning to compute without the concept of zero or in Roman numerals.
There are classes in math departments where you work in structures that are similar to the numbers you know but where you don't use zero, and there are also sometimes cross-listed courses in math and history where you do things like compute using different numerical notation systems or in different bases.
> For example, they can't teach you about Descartes' epistemology without also getting into his ignorant dualism.
? His dualism is epistemological, idk what you're even picturing here