Tbf, on my physics course (not necessarily all physics courses mind) you start of with waves and such, but soon move on from that kind of understanding and just focus on the maths.
That applied for almost every module, not just quantum.
Yeah, I don't understand where this is coming from. If you're not teaching the math, what are you even doing? Maybe it's from pop-sci books or something where they're really selling woo rather than comprehension?
My books went from 2 slit experiments, to particle in a box (1d and then 2d harmonic oscillators) with tunneling, and then the Hydrogen atom potential with electron orbitals as an extension, to perturbations for He, to Hartree-Fock and Born-Oppenheimer for large atoms and molecular models. Learning the <bra/ket> formalism can be useful for thinking about it, but it has to be motivated by the math.
I guess black body and scattering were pretty early too as motivation for the developments (as they historically were). Whereas EPR/Bell, Decoherence, and "Interpretations" were mostly discussed as interesting flavor and philosophical arguments.