There appears to be three main MLC approaches to divorce.
Some start it early in the MLC and this is usually over fairly quickly.
The second starts the divorce later on in the crisis when other stuff is going badly and then it seems to drag on for months and even years,
and the third talks about it endlessly and may even start it, but never finishes it.
I think if you are looking for 'reasons' some of them seem to think that divorce will 'solve' their problems and they get it over quickly Others are less sure, and drag it out and also use the process as a punishment.
Very well put Beatrice, I agree completely and I think you are dead on with your explanation.
I would only add that DIVORCE = SPACE The MLC'er will get it one way or the other.