Introductory courses are hard because everyone has different ideas of where to start.
At high levels, international standards have existed for a long time. Decades ago, in the height of the Cold War, a Russian series of physics textbooks was the standard worldwide. It's still used today. It has some generic physics names, but is referred to as "Landau and Lifshitz." If we could use a Soviet authored standard set of physics books in the US in the 1960s, we could probably use international standards today as well.
I think the problem we have is that most people don't like being told what to do. If you're a school board member or a university trustee, you're not going to want to hear that your philosophy of how education should be done is not the standard, and that's just too bad.
Landau and Lifshitz is notoriously difficult for starting students, and its adoption led in part to the design of undergraduate physics education as a primer for graduate school rather than training to be a working scientist. This may sound irrelevant and minor, but that is a very different philosophy than most science and engineering fields, and it was just too bad for educators and students who thought BS Physics holders should be able to work in physics.
More on topic... many physics books (including Landau and Lifshitz) are available online already. Others are available at very reduced cost through Dover publishing. Often, the US government efforts to "modernize" physics textbooks (teaching 100 year old physics) pay professors to write new and expensive textbooks. When the granting agency that supplies all of your research funding recommends a textbook, it's very hard to say "no." An amazing amount of the publishing business in science is driven by unintended consequences of granting agency policies.