Pfatteicher's Dissent

Throughout my series, I've suggested that expressing continuity between Advent and Lent is desirable. Philip Pfatteicher, Lutheran liturgist extraordinaire and among my academic heroes, disagrees.  Here's his thinking from the Manual on the Liturgy for the Lutheran Book of Worship:

The traditional color of Advent purple, the royal color of the coming King. The preferred color in the Lutheran Book of Worship, however, is blue, which has a precedent in the Swedish Church and in the Mozarabic rite. Blue suggests hope, a primary theme of Advent. In any case, the Advent parakeets should not be the same as those used for Lent, for the character of the two seasons is quite different, and the only symbol common to both seasons is the Lamb of God.

No word on if his reasoning pertains exclusively to symbols embroider on the vestments and paraments (such as a Star of Bethlehem for Advent and the Spear of Longinus for Lent) or if his thinking extends to even simple vestments free of added emblems.