I know that QM is the most accurate theory ever devised and has passed every test so far.
That claim is all bombast and propaganda. By the calculations of mainstream physics, about 95% percent of the universe is composed of mysterious dark matter/energy. In other words they have NO IDEA was 95% of the universe is made of. What amazing accuracy! If that counts as 'passing every test so far,' then I dear say they have set the bar too low.
The only reason that QM is "accurate" about some things is because contemporary physicists push equations to match data. If you are tailoring your equations to match your data, well then of course your equations are going to be accurate. Mainstream physics is far from accurate. In fact, they really have no idea how far off they are and how many mistakes have been built into their equations over the decades, which are then 'corrected' by post-hoc equations that are, again, tailored to fit the data. And if they can't figure out a way to bend the equations to fit the data, they simply invent new particles and/or new forces. Hell, with an empty vacuum full of virtual particles, physicists are now like
I only know of one theorist who has gone back to the fundamental postulates and equations of Newton, Maxwell, Einstein, Lagrange, Planck, Boltzmann and many others to identify and fix their mistakes, while at the same time delivering a truly mechanical theory that is wholly compatible with the empirical results of QM. He has also solved the 'mystery' of dark matter/energy.