I've been having exactly this discussion with people for - oh, about fifteen or sixteen years now.
I completely agree with your premise, but the difficulty arises from the simple fact that many of the people running university degree programs in the arts, and in particular the performing arts, have little or no practical experience as working artists themselves. They're academics, and the entirety of their professional experience has occured in an academic setting. For the remainder of those who actually have worked out there in "the real world", their own business skills may be marginal-to-non-existent, and which possibly contributed to their shift from profressional to academic career tracks in the first place. Meanwhile, the handful that do "get" the need for teaching the BUSINESS side of "Show Business" frequently have good intentions. but just as often run into resistance within their own departments. "That's not our job," they're told, or, "we do not wish to sully our art with considerations of crass commerce", or, "if artists want to be business people, they should pursue an MBA degree," or other such nonsense.
Frequently this attitude comes from a position of simple ignorance, but it also can come from a fear that putting students in the position of honestly confronting some of the more difficult challenges of their profession, particularly ones that instructors themselves find problematic, may only serve to discourage students from pursuing their particular degree program; and nowadays, with the explosive growth of liberal arts programs, particular those in the performing arts in the past 10 - 15 years, nobody wants to do anything to upset their cash-cow.
As a result, literally thousands, if not tens of thousands of young performers are handed their diplomas, and thrust out into the highly competitive (and in my opinion, already over saturated) marketplace, with at best, only the most minimal business skills required to successfully develop and maintain a professional working career. But for the most part, nobody has spoken to them about developing a business plan, about marketing (other than, "get headshots"), about personal or business finances, about taxes, about - well, about anything that could have a significant financial impact on their careers. And so, they're left to flounder around helplessly, maybe picking up a few things as they go along, or perhaps at some point coming to the realization that they're deficient in these areas, at which point they may seek out expertise or additional education to get up-to-speed.
But for the most part, what I see when I conduct tax seminars, or on rare occasions get invited to actually come speak to students on the subject, are young performers who, for the most part have never even paid taxes, let alone prepared their own returns, who haven't the faintest idea about deducting business expenses, or, about categorizing and allocating income and expenses; heck, most don't even know how to correctly fill out employment forms! And frankly, even a lot of established working artists just don't have enough of a "left brain/right brain balance" to fully understand math and related concepts (although truthfully, if I can do it, anyone else can too, given sufficient time, training, and motivation), so they just let it slide until the problem finally becomes too intractable to ignore, THEN they start hunting around for someone - anyone to help them out, which unfortunately, most often means they end up someplace like H&R Block, where the so-called "tax specialists" don't have any better understanding of the specific issues relating to their profession than they do! This is generally the point where they start showing up on my "doorstep".