For most people being a sahm takes away financial independence.
Having a good amount travel suffered to each month isnt financial independence.
The reason I think people should think about divorce when sahm is, all the sahp on this thread are happy. They absolutely love what they do, they love their lifestyle love being there for every school drop off. Dont feel they sacrificed anything. Their husbands are more than happy with them being a sahp, because their career can take off (oddly many womens careers take off without having a sahp, but that's another debate), they dint want the kids in childcare etc.
Then the marriage ends. All of a sudden the sahp is talking about how they want more than half because they have sacrificed so much, the working parent feels he is getting the piss taken out of him and does see why, when the sahp doesnt contribute financially they should get more than half of everything including their pension. All of a sudden it seems no one was happy with this situation at all. Divorce makes people draw battle lines. People seem to have forgotten all the benefits of their lifestyles and it becomes about which sactficed and contributed more.
Obviously this doesnt happen in all cases, but it does happen alot.
Also, if your kids need you at home (genuinely need you at home) what do you do in the event of a divorce? Spousal maintenance is rare. CMS let's men take the piss and often isnt enough to stay at home. The kids see their parents split, may have to move etc and then all of a sudden they have to go into childcare, come home to an empty house because their mother has had to find a job.
I am not judging and saying anyone has the answer. But when I divorced, apart from the big fact we werent together, the kids life continued as normal. No massive lifestyle changes. Which helped the transition.