Thanks for your question. Yes, I am saying that ecclesial vocations imply much more than that these are lived within the Church, though that will also be true. I have written here that such vocations belong to the Church before they belong to an individual called to live them. I have also said that such vocations are edifying to the Church; that is, they build up the Church and are a call to do that. Finally, I have noted that ecclesial vocations call for both clergy and laity to be faithful to their vocations as clergy and People of the faith. The essential meaning of an ecclesial vocation combines these dimensions. It refers to a vocation that builds the Church in a way that lets it truly be the Church God wills it to be, and that does all of this in the name (authority) of the Church.
To be called to an ecclesial vocation means that one embraces this vocation not only because the Church explicitly calls one to do so (note the public call at the beginning of the rite of perpetual profession which symbolizes the culmination of a whole process of mutual discernment by diocesan personnel, mentors working with such personnel, and the candidate herself), but because one is prepared to consciously do so "in the name of the Church". Yes, one lives one's hermit life as part of the Church (as do non-canonical hermits in the Church), but one also does so by the authority of the Church. Because of this explicit authorization, one also accepts the responsibility to "be Church", to pray as the Church is called to pray, to minister in one's solitude, to grow and mature in Christ and the power of the Spirit as is true of the Church and to do so because the Church as Body of Christ has herself called one to do so. The Church entrusts such vocations to some because she believes that only through such vocations can the Church be what God calls it to be. She recognizes that such vocations are an integral part of her own call to holiness.
While c 603, for instance, explicitly provides for flexibility in this vocation, the hermit takes on a meaningful place within a tradition of eremitical life. This does not allow the hermit to make up her life out of whole cloth. She prays as God calls her to, yes, and at the same time, she does so with forms of prayer the Church sets at the center of her life and in an ordered way that reflects the rhythm of prayer that sanctifies the whole of one's life. I believe most non-canonical hermits will do the same in their personal response to God, but not all and not necessarily.Unfortunately, some self-designated "hermits" do indeed make up a way of eremitical life without reference to the Church's supervision and vision of it; they embrace prayer lives essentially cut off from the liturgical life of the Church, for instance, and justify it in terms of a theologically, spiritually, psychologically, and historically naive notion of "solitude", among other things. Hermits with an ecclesial vocation cannot and do not cut themselves off from the historical Church, the ecclesia (assembly of "called ones") that exists in space and time. We cannot omit going to Mass (or receiving Communion as an extension of the community's Eucharistic liturgy) regularly, for example, nor can we neatly divide reality up in terms of the spiritual and the temporal and then reject the temporal in the name of the Spirit of God. That would be a betrayal of the Holy Spirit herself. Our Church is a sacramental reality where the spiritual and temporal presuppose and even require one another if the Church is to be what it is called and empowered by God to be, namely, a primordial sacrament where heaven and earth interpenetrate one another in a paradigmatic and yet-proleptic way.
I believe such "hermits" are exceptions and, as I already noted, most non-canonical hermits live their lives in ways that, of course, also build up the Church even if they do not do this consciously or in the name of the Church. Canonical hermits are meant to do so consciously as part of a public vocation. When I speak of ecclesial vocations, then, I am speaking of those whom the Church herself calls forward in her public liturgy and formally commissions through profession** and consecration to 1) live and build up the life of the Church in a conscious way and 2) to do so in the name (authority) of the Church as solitary hermits under c 603, or alternately, as part of a canonical congregation or community of hermits. It is a specific responsibility given publicly by God through representatives (Bishops) of the Church to some hermits who receive and commit to undertaking this specific commission formally in their acts of profession and their embrace of God's consecration. Let me reiterate once more that it does not make canonical hermits better than non-canonical hermits, but it does say their formal and canonical responsibilities differ from those of non-canonical hermits.