It is also reasonable to omit the use of it in private devotions, since it is not a required prayer such as the Pater Noster (Our Father) or the Creed. In addition, prayers and devotions to the Holy Theotokos are not in any way mandatory in the way as they are to the Holy Trinity.
In my understanding of Orthodoxy, prayers to the Trinity are necessary and essential to the Christian life and salvation, where as prayers invoking the aid of the Theotokos and the saints help us along the way, but are not necessary for salvation as prayers to the persons of the Trinity are.
With Justinianus' explanation of what he means here in mind, I would also like to add that I am not sure if we can say this at all. If it is purely in the realm of private devotions, then yes, maybe this can be said. But there is a reason why Orthodoxy, no matter which rite you use (Greek, Syriac, Coptic, etc.), has ALWAYS incorporated prayers to the Mother of God and to the saints (either in general, or specific ones on their feast days, or specific ones who are important enough to be commemorated daily) IN THE LITURGICAL PRAYER OF THE CHURCH. So I don't know if we can say that prayer to the Mother of God and to the saints is not necessary for salvation: certainly in the realm of liturgical prayer, which is very important (perhaps most important?) in the lives of Orthodox Christians, such prayer is specifically required.
Furthermore, you need to define what is a "private devotion". I don't think you can compare the Akathist to the Rosary in this sense, because the Akathist can and is used in public liturgical worship (I think one can be said at Compline, for example?). The Rosary would never be incorporated into liturgical worship in the RCC, however. There is no precedent for that. While praying the Akathist privately might constitute a private devotion, I think it differs fundamentally from the Rosary in this: that the former can/is used liturgically.
In MY understanding of Orthodoxy, prayers to the Holy Trinity, the Theotokos, and all the Saints are essential. We are worshipping with the entire heavenly host, together giving praise to our God. Closest to God is His and our Mother. Isn't it fitting that glorification be mandatory for her too??
Well, you're using "mandatory" just as Justinianus was, Bobby, and while it doesn't sound as legalistic as what he said originally, I still wonder if this kind of language is applicable to this situation. If I had to make a choice, though, I'm on your side on this one.