Agreed. The Church can’t define what She doesn’t know, or what hasn’t been revealed. Maybe Our Blessed Mom will appear again and straighten out the matter. Or maybe she fell into a deep coma, simulating death, and we are all wrong.
I really don’t care whether she died or not, (my inclination is that she did die),
BOTTOM LINE: my belief in the Assumption is unshakable.
It’s not a matter of what the Church “knows.” After all Jesus Christ is the head of the Church (and he knows all), The BVM, Apostles and Saints in heaven are also a part of the Church (and they know too.) What actually happens is that the Church guided by the Holy Spirit, in compliance with God’s Economy for our Salvation, reveals deeper truths when the time is appropriate.
For example, The Assumption was taught since ancient times. It’s not as if the Church didn’t “know” that the BVM was assumed until 1950. Rather it was finally deemed timely to make this teaching “de Fide” for the Universal Church.
Another: Papal infallibility didn’t just get “discovered” in 1870. It was always taught. But then it was deemed timely to make a dogmatic declaration for the Universal Church.
Some of the reasons that prevent the Church from making a solemn declaration is that there are usually a number of other tangent beliefs that may be impacted by the declaration. Therefore it must be carefully integrated into the Church’s whole fabric of teaching, and this may take time.
Right now there is a lot of argument about whether the BVM died. It’s NOT that the Church doesn’t know one way or the other. Jesus Christ our King knows. His Mother certainly knows. The Angels and Saints in heaven all know. The Church has ALWAYS taught that she died (until these latter days, when suddenly there was some doubt.) IOW, the Church knows that she died. But it has not been deemed timely to make the teaching of her death de Fide for the Universal Church.
That is why in M.D. the teaching of the death of the BVM used poetic language rather than legal terms. “Having completed the course of her earthly life” is a poetic way of saying when she died. If they had used legal terms, the tangent beliefs of the resurrection and glorification of her body would need to have been addressed. That would have distracted from the ONLY POINT of M.D. which was to affirm the Assumption of the BVM.
That is why St. Pope JP II said it was not explicitly stated in M.D. But that otherwise, there should be no doubt that she died.