http://members.cox.net/vipr/bao/ancestor.html
Plane compertum est, which allowed Asian Catholics to participate in the cult of Confucius and the veneration of ancestors, did so only because these rituals, “although in earlier times they were tied in with pagan rites, now that customs and minds have changed with the flow of the centuries, merely preserve civil expression of devotion toward ancestors, or of patriotism, or of respect for fellow countrymen.”
Not at all unlike Pius XII's licensing of the use of orchestral instruments for Mass in 1955/6, or his permission to use women in parish choirs.
Of course, "traditional" Catholics had been DOING both for quite a number of years (e.g., Mozart's patrons in Vienna and virtually ALL parish choirs in the USA, respectively) but hey--if it's done in the Old Rite, it HAS to be a legitimate innovation, as opposed to what's done in the NO.