I don’t think anyone disputes the value of using selected elements in the LOTH as private devotion. The question is sort of “when does it become liturgy”? Liturgy is the official prayer of the Church and IMHO joining one’s self to the Church’s liturgy is of great value. Over time it has become for me an indispensable source of renewal for my faith especially in times of great doubt.
I will say though, that based on my monastic experience, that abridging the LOTH, but doing the part you say faithful to the rubrics, is participating in the LOTH even if you don’t say an entire hour.
At the abbey, there are monks who must leave in the middle of an Office to attend to some necessary task. The brothers, for instance, who are assigned to some timely early morning tasks were dispensed from the second nocturne of Vigils. If they miss the second nocturne, does it mean that they weren’t participating in “liturgy”? Absolutely not! Their necessary work simply completes their prayer. God understands. or the elderly monk who needs more time to get to the refectory at the mid-day Office is dismissed early. It is still liturgy for him.
Occasionally a monk is held back by some necessary task and arrives late at the Office; Has he “participated” in the Liturgy? Absolutely.
So if a constraint obliges one to abridge an Office… be it a hymn or at some other point part way through, I think it is still liturgy. Even using the abridged Magnificat MP and EP is, assuming official texts are used, “liturgy”. Usually a psalm or canticle is omitted but the texts are identical to the LOTH. So there is one part of the LOTH that is being faithfully recited if one uses the Magnificat abridged version. It’s just some of the Office that is omitted for valid reasons. It’s no different than dismissing a working brother early from an Office so he can attend to his assigned duties (e.g. baking bread early in the morning). The part attended is 100% faithful to the LOTH. It is still participation in the liturgy. Perhaps not full participation, but it is participating fully in the portion attended.
So indeed we do have to be mindful of not descending into a strict legalism. The Law serves Man, not Man the Law. The Law allows for partial participation in certain circumstances without it losing its liturgical character. Now if one ignored a mandatory memorial, or said Lauds in the evening, or used antiphons different from the great “O” antiphons the last week in Advent, that is valid prayer, but not liturgical prayer. But if one prays the correct Office up to, say the intercessions, or omits the last psalm or canticle because of a necessary time constraint, then one is praying liturgy, at least in part, if not in full.
I have to thank Jim in particular, his interventions really got me thinking about this and realizing that I should be taking my cues, as a Benedictine, from my community who have always made practical allowances for particular circumstances.