One key word there, AFAIK, being representation. To lower the abstraction level a bit: In tangible 1-D Schrodinger first-year QM terms: 1) All of the informati

One key word there, AFAIK, being representation. To lower the abstraction level a bit: In tangible 1-D Schrodinger first-year QM terms: 1) All of the information about the state is in the wave function. 2) Per Fourier type limits, you cannot even represent in a wave function known position and known momentum past a limit on the multiplcative product of calculable "spreads" or uncertainties. (Smaller spread in position as implied in a wavefunction forces larger spread in momentum as calculated from the same.) This can clarify that the limit is not because "measurement introduces disturbance". Rather, representation forces spread(s).