You are definitely correct here @Mistspren. Brandon goes to quite a lot of trouble to keep Cosmere physics consistent. He has stated, investiture follows thermodynamics and can be thought of as third universal form of the Cosmere (matter, energy, investiture). I read a rather long post from Brandon on all the work his group did on getting redshift and speed bubbles to make sense. I think it is safe to say any fundamental principals of physics in our world are consistent with the Cosmere, unless acted upon by Investiture.
The topic of how Quantum mechanics would impact our story is a different matter. We have had some Quantum understanding for around 100 years. We can postulate what tech may be made possible one day but none of us are renting time machines to extend a Holiday. Perhaps we could speculate a bit on how long Quantum Hoid has understood Quantum mechanics. Of course, that will lead us to speculate on if it matters. If Quantum Hoid has time travel hey may have worked it all out yesterday. Or tomorrow.