I just don't know the importance of it. In my jurisdiction, adultery (actual intercourse) will allow a D to process without the otherwise mandatory time delay... but other than that, it does not (is not supposed to) affect the court decision on dissolution... I suppose unless it brings into question character which might be useful in negotiations...
Anyhow, I will likely bring it up with my L just as a matter of course, but otherwise... not sure why mud slinging around an A is valuable...