We clean house on Friday after work and then go out for dinner; it's our "ancient theological tradition". I doubt that there is anything "theological" about Mary being taken away, bones and all, to heaven.
Whether there is or not, my Bible tells me not to be a "stumbling block" to other Christians. Since I don't believe it matters to our salvation one way or the other whether one believes Mary's body ascended to Heaven, it's no big deal to me. Who am I to judge another's servant? My best friend is a 7th Day Adventist. While 7th dayers are strictly biblical in their faith they believe in keeping the Old Testament dietary habits and the Saturday Sabbath. Although I believe Jesus' new covenant releases us from this part of the law, I don't argue with him over it. In fact, when we are together I try not to eat pork or shellfish so as not to be a stumbling block to him. He is devout child of Christ and it would be a sin for me to do anything which could interfere with that.
You know what? I'm not trying to dump my beliefs on anyone. I was justing giving information.
I doubt you know anything about the theology contained in Munificentissimus Deus.