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Relationships are such a complex thing to simply say "it's just better To be divorced" 
I don't have stats here, but I do have a very close personal friend of mine, his parents are considered "separated" but chose to live together for their son or my friend. They're thankfully well off enough to build a granny-flat at the back of the house and the father lived in the small house at the back. Which has a bed, tv, toilet and small kitchen. 
His mom and dad just can't live with each other in the same home, were always at each other's throats, but since his dad moved into his little home at the back, the parents has been good friends ever since and my friend would attest both his mom and dad never took any other partners. It's a strange dynamic. 
They're both retired and the living arrangement is still the same, they go to each other's houses daily and share meals and do life together still.
I don't think its a black or white thing. There are stained relationships which still maintain civil and they are ones that are totally unhinged. 
There are also scenarios where it get unhinged when the parents are actually seperated and put the anger on the child. 
Its a situation where you should look individually at it. But I agree, that there should not put blame or burden on a child. Parents have to fill a role and put their individual needs behind. But there are so many factors which can influence the situation. >

There are bad co-parenting situations where the parents are separated, and there are okayish situations where the parents do their best to tolerate each other together, but I dont think theres many situations where staying together where, without kids, you would separate, ever actually improves things. >


but I dont think theres many situations where staying together where, without kids, you would separate, ever actually improves things.

It often comes with monetary situation, some people cant afford to support children and have two homes. But yes, in general its probably true. To still live together when otherwise being seperated you have to be very mature about the situation and that can be very hard when feelings are involved. >

Fair point about the financial aspect. If you're very poor and can manage to be respectful of your co-parent then staying together is probably the right call. >

Depends on what you mean by "strained". If their romantic relationship is strained but not hopeless, and they can live together in peace and still feel happy about that, I don't see anything wrong with that. 
If the marriage is making them unhappy, then yes, get divorced, 100%. If the relationship starts getting toxic, if there's a lot of fighting and screaming and such, then yes, get divorced. But "strained" feels a bit mild, or at least like a very broad term. >

except that financially the kid is better of, and that single parent parenting also tends to fuck a kid up, not to mention that most of them don't fight in front of the kid, its the minority that does so. >

Sources? >

Depends on how much they hate each other. "Strained relationship" can encompass a wide range. >

To the point of where they have nothing good to say about each other, and only speak bad about each other.
To the point where the child has to be the one speaking on each parent's behalf whenever one of them needs to tell the other something.
To the point where it's basically clear avoidance. >

I have read the comment, and tbf it is a very valid point. It's just unfortunate that some parents cannot manage their emotions whenever their children is present, even though they both know that they have to co-operate. >

Wouldn’t therapy be an even better idea than divorce?