Traditionalist vs. Conservative

Jeff Mirus, OK, so what sort of renewal did Vatican II prescribe?

Christopher Ferrara responds to an earlier piece by Mirus, Pope Francis: Tough Talk About Vatican II

Some traditionalists (especially Americans) may deny that some problems pre-existed the council. But was the council itself a necessary part of the solution? (Especially given that it did not define any dogma in opposition to a heretical opinion?) How many of the previous councils can be considered to be of the same importance as Trent when it came to reforming the Latin churches?