Depends how one is defining “dogma.” If using the pure RCC definition, sure, they are settled.
That says, “baggage” grows up around any given dogma, and, IMHO, the proof behind any given dogma should be revisited, simply as an intellectual exercise to strengthen one’s faith and sharpen belief.
The process also prevent heresy from slipping in.
That part is true. But it is then not the dogma but the "baggage" that needs to be re-evaluated. Here is an example. There is a dogma of the Purgatory: that a soul destined for Heaven undergoes a state of temporal purification after death. There is a baggage around it: the image of suffering from physical fire in some physical place. The Pope not long ago reminded us that the latter is but a way to imagine the Purgatory; we don't know anything about the duration of it, nor of the precise form of the purification and suffering. But did the Pope alter the dogma? No. He clarified it.