I agree to a huge extent with Mitzpah:, I, too, in the early years compared myself and my situation to others and so often tried to follow a "proven" path....
Learning from others is great, and I, like so many others, look for and am drawn to situations which appear similar to see what can work and what won't.
I of course am now the one further along this path than so many others; perhaps others are looking at my situation and seeing what NOT to do. Or perhaps they take something useful.
I, too, remember early motherhood and feeling so very inadequate because my children were different; it took a huge amount of energy to realise that I had to do what was right for my own children, not for anyone else's. In so many ways the same applies to my H's MLC.
Comparisons may be more useful earlier on in the process, when there seem to be so many more similarities -- and working out if it is MLC (or whatever crisis we are calling it) in the first place.
As this is one of the few places that supports standing, and the idea that our spouses are in a crisis rather than horrible people in their core, that is one of the most useful things.
As each one's crisis progresses the differences start to show up; that is when it can be useful to see that we aren't completely alone, because the "real" world has a tendency to just want it done and dusted.
The place where comparisons are destructive are, yes, as others have said, where they are used to judge someone for doing something that "didn't work" -- when the person judging did something else that "did" work.
Or where someone is so angry that they can't see why someone else might not be equally angry with their spouse and treat them kindly.
Or where a standing spouse who comes here to say that she or he is lonely, and they are told "well, you chose to stand, it is lonely, your own fault". That kind of thing.
But that now veers into the whole idea of if we do or don't accept MLC or not....