There is some serious doubt that what some consider to be a violation of Trent would be any real world violation. Trent itself noted that any form of the Mass in the Roman Rite that was less than several hundred years old (I believe it was 200, but I am not going to look it up) were suppressed. as a result, there are several forms extent, such as the Dominican Rite; all tend to have a narrow use.
One can get into all sorts of permutations of arguments about the OF; and the vast majority of it is a waste of good oxygen. Sacrosanctum Concilium did not “suppress” the EF, but I doubt that when the bishops voted on it, they had any intention of having two forms of the Mass continue. They intended to modify the EF, and that is what occurred. The dust up after the introduction of the OF was in part due to those who wanted no or only very minimal changes, and to the fact that enough changes were made that it upset a minority who protested loudly. Some of them were SSPX, some were not. Both John Paul 2 and Benedict 16 have tried to deal with those who objected, and there were a number of bishops who felt strongly that having 2 forms of the Rite was not a wise decision.
The vast majority of Masses said, and the vast majority of people attending Mass, do so in the OF. Precious little is said by them of the EF; in fact, it would be no surprise if a poll were taken and large numbers of Mass going Catholics were essentially unaware of the EF.
Vatican 2 did not merely make the OF optional. Vatican 2, as set out by the bishops, removed things which had been added to the Mass, often well before Trent but carried through by Trent, and put back into the Mass things which had been lost. And perhaps what assisted the OF in spreading like wildfire was the move to the vernacular. The OF may be said in all Lating (and the smattering of Greek); it cane be said partially in the native tongue (e.g English, Spanish, French) and partially in Latin/Greek, or it can be said all in the vernacular.
An example of how well the vernacular was appreciated: my mother was born in 1917. She, my dad, and eventually all of us siblings had a missal. One day about 10 or 15 years ago I asked her what she thought of the changes of Vatican 2. Her immediate and positive response was “Oh! The Mass in English!” after she retired, she was an almost daily Mass goer. Rubrics? I am not sure she even knew the word, and none of it much mattered to her. Being able to follow the priest without having to read something was the major plus.
I suspect that it is the same for most who attend the OF.