This has been said umpteen times in various threads, but just to keep things in perspective, I’ll note it again: the usages suppressed by Trent were those which had not been in continuous use for at least 200 years before Trent. Among those suppressed were the Gothic and the Sarum, both of which had fallen into disuse. OTOH, the Ambrosian, Mozarabic, and Bragan usages were retained, and still exist.
Those that were suppressed included a number of local variants which had sprung up in various places within that 200 year guideline.
Preserved as well were the proper usages of the Dominicans, Carthusians, Cistercisns, and Carmelites, (albeit that the Carthusian was recently “reformed” and the Carmelite is in a state of suspended animation), all of which had likewise been in continuous use for over 200 years at the time.