The history of Lauds is the history of the office's two competing instincts, played out at dawn. The cathedral tradition kept the hour selective and symbolic, the same beloved psalms every day, because a congregation prays best what it knows by heart. The monastic tradition, committed to the whole psalter, pulled the hour toward variety and length, and the medieval Western Lauds became a compromise: variable psalms by day of the week, but the old constants, the Old Testament canticle and the laudate psalms, holding their ground, with the Benedictus crowning the whole.
Reform kept adjusting the balance. Pius X's redistribution of the psalter in 1911 broke the daily recitation of 148 to 150, to the lament of liturgical historians, since it severed the hour from its own name; the 1971 Liturgy of the Hours rebuilt morning prayer as a service of one morning psalm, one Old Testament canticle and one psalm of praise, a deliberate return to the cathedral pattern in miniature.
Beyond the Latin world the dawn office never lost its public character. The Byzantine orthros ends in its own lauds, the ainoi, with the same psalms 148 to 150 sung as the sun rises, and Anglican Morning Prayer carried the Benedictus to every parish church in the English-speaking world. The hour's persistence across all these forms rests on its match of content to moment: no other office has its meaning written in the sky above the person praying it.