Because "Recent reforms have amply demonstrated that fresh changes in the liturgy could lead to nothing but complete bewilderment in the faithful who already show signs of uneasiness and lessening of Faith." *
* The quote is from Cardinal Alfredo Ottaviani and Cardinal Antonio Bacci to Paul VI on September 25, 1969 in the The Ottaviani Intervention This is the sixth of 62 reasons which were submitted by the Priests of Campos and endorsed by the late great Bishop Castro de Mayer.