@KungBooPanda
Yes, from a purely selfish point of view I think my childhood and early-mid teens would have been much happier had my parents split. Father had issues with alcohol and had grown up with a completely domineering Mother of his own. My own Mother was a vicious narcissist, so their relationship revolved around F being absent and drinking their money, and then grovelling to M to the point whereby he let her walk all over him, wouldn't stand up to her in any scenario even when she was being ridiculous, and M taking out all her frustrations on me, which included simple neglect, violence, and constantly being so irascible that she was completely unapproachable for any reason whatsoever, and any attempt to ask her for anything typically required by children was met with a tirade about how undeserving/needy/demanding/ungrateful you were.
My F was largely absent in terms of being involved in his children's lives, but when he was present he was invariably approachable, pleasant, personable, and never ever raised his hands or his voice to us except once or twice when behaviour had been so poor we really did deserve a bit of disciplining. I had to rely on him for absolutely every aspect of parenting because my mother was the total opposite. Despite being present, she was worse than useless and actively made my live utterly miserable. This continued to be the case long after my F stopped drinking completely, the only real effect of which is that he became much more outwardly miserable, although he was still approachable if you chose the right moment, normally when M was out of earshot.
I've long thought that had they split my F may well have drunk himself to death, but as he was mostly absent in any case it wouldn't have made a lot of difference. M may have been less stressed and less of gorgon had they been permanently split, but I'm not certain about that because even after F's behaviour changed completely she still remained a cantankerous, nasty, cold, thoughtless person, and to be honest I think that's just her nature because she's much the same decades on. I don't see how my experience could have been any worse had they split, because as things were my mental health was wrecked by my mother in any case, and the home environment was utterly hostile to typical things like maintaining friendships with schoolfriends, seeing and visiting relatives, or participating in hobbies and so on, so the privations that may have come with living with a single parent wouldn't have made any difference there, in fact, that aspect, and my mental health could only have improved.
My M is the single biggest reason why I have no relationships with any of our near or extended relatives, why I've had a lifetime of up and down mental health issues, and why I've always been extremely reluctant to do "family" things as an adult, including introducing friends and partners to my parents. Despite that, it's my mild-mannered, kind, generous, warm F who is still considered to be the problematic one because of something he stopped doing nearly 40 years ago. The stigma and shame back then from coming from a "broken" home wouldn't have bothered me one iota, because my home was utterly dysfunctional and "broken" as it was, to the point whereby they were an ongoing embarrassment to me anyway.