I just don't think it makes divorce real enough. A kid might see this Abby segment and think "Well divorce is something that happens to other people and they're fine now but it's not something I need to worry about." But if divorce actually does happen to them, it's a very different story. It's a lot harder to handle when it's actually happening to you.
I see what you're getting at, but we all have to realize, this is for 3-5 year olds. They do need to realize everything's okay, even if it's a little dishonest. They're more mature than we realize, sure... but messy and complex will just make this thing incredibly difficult for the child to understand. It's like when they tackled Mr. Hooper's death, they said he was gone and never coming back. They did not say "Mr. Hooper was fighting off an life long illness, and in the end, we all die." Older kids know that, but the target audience doesn't need to know. If you tell a little kid about mortality, they'll either not underhand the concept or freak the heck out that they're going to die, even eventually. When you're old enough, you come to terms with these things. There are many reasons why parents get divorced... do we want to tell kids that mommy or daddy was cheating at that age? That's for them to find out and learn later. DTF put it very succinctly.
Actually, I have to admit, showing the parents fighting isn't exactly a good idea anyway. There was this episode of Arthur where the parents got into a big fight, and through the entire episode Arthur and D.W. worried that their parents would get a divorce. At one point, they feared repercussions of custody battles, in an imagine spot Arthur never got to see D.W. or Pal (which is his dog anyway). There's a real fear that if they show parents fighting then getting a divorce, kids who aren't going through this WILL think their parents will get a divorce and they'll be in the middle. I swear I was in constant fear of that at some point... scarier still, as I said, it almost happened. They still fight a lot. They're VERY passive aggressive people.
Like I said before, the Fat Albert episode works fine for older kids. It shows quite a few arguments (The father even making a nasty comment about the wife "Spending all [his] money"). Albert is for 7-10 year olds. They understand complexity more.