As we lack the means to represent the different options we probably do not have a law that paradoxes will be avoided (partly because we do not have a technical analogoue for “paradox”)
In the extended ontology what corresponds to old time would be an open question. That is if you have a multivalued state in the past and some of the values of that are effects of (partial) values in the future it’s still pretty much “time travel”.
I also thought that qunatum mechanics is pretty chill with superposition. Could not one extend the model by having a different imaginary unit and then have a superposition of amplitudes? And I thought getting a sure eigenvalue is a special case. Isn’t the non-eigenvalue case already covering a simultanoues attribution of multiple real values? I case there are two cases 1) we do not represent that currently in our models or 2) Our representations used in our models can not represent that.