Good day bro just to clarify a few things. What do you mean by "remains only a title" and "by logic"?
I don't mean to sound like I know it all (because I don't) but according to what I've learned so far:
*Queen of Heaven is a title given to the Blessed Virgin Mary by Christians, mainly of the Roman Catholic Church, and also, to some extent, in the Anglican, Lutheran, and Eastern Orthodox churches, to whom the title is a (disputed) consequence of the Council of Ephesus in the fifth century, where the Virgin Mary was proclaimed "theotokos" ("God-bearer," "birthgiver of God" or the "one who gives birth to God" among other translations), a title rendered in Latin as Mater Dei, "Mother of God".
The Catholic teaching on this subject is expressed in the papal encyclical Ad Caeli Reginam, issued by Pope Pius XII. It states Mary is called the Queen of Heaven because her Son, Jesus Christ, is the King of Israel and heavenly King of the Universe. In the Hebrew tradition, (this can be found in the Old Testament) the mother of the king is the queen. Catholic dogma (Apostolic Constitution Munificentissimus Deus) states that the Virgin Mary, having completed the course of her earthly life, was assumed body and soul into heavenly glory. The title Queen of Heaven has long been a Catholic tradition, included in prayers and devotional literature, and seen in Western art in the subject of the Coronation of the Virgin, from the High Middle Ages, long before it was given a formal dogmatic definition status by the Church. For centuries, Catholics, while reciting the Litany of Loreto were already invoking Mary as "Queen of Heaven".*
Therefore, it is most befitting to call her Queen of All Saints bec. after all what is in heaven is a Communion of Saints.
And with regards to that "change of heart" thing, "faith" and "charity" isn't something that we turn on or off anytime we find it convenient. There is no such thing as last minute change of heart nor "accidental" saints. The process of canonization is an arduous task. I remember this quote, "Where your treasure is, that's where your heart is also." (or something like that).
So since God knows the disposition of our hearts, it is imperative that we realize none of these saints came to be canonized bec. they had a last minute resort. Yes they had their own shortcomings just like the rest of us but they've struggled and perfected such lives in purity and holiness until the end.
That's all for now.