Earlier quoted context omitted.
Other than the legal and financial ramifications, it’s not significantly different than any other breakup of a relationship due to poor fit. Don’t read into it too much.
In quite a lot of cultural traditions, the point of marriage is supposed to be that it is significantly different and you won't break up due to poor fit. I don't mean this as a personal callout, I'm glad you've found happiness, but when people complain about serial monogamy creating "a loose bond" what they mean is that it makes your view of marriage seem obvious and their view of marriage seem impractical.
Which is not to say that you can't end up with a poor fit anyway. You're just compelled by social expectations (if not legal requirements) to stay together despite the poor fit, often to the detriment of everyone involved.
Sometimes people do give up too easily, and could make the marriage work if they just had a bit more incentive to try. That's where systems which grant marriage more permanence shine. But on other occasions the problems run deeper, and separation may well be the correct answer.
In any case, since people have learned that they can get most of what they want out of a relationship without actually getting married, stronger / less reversible marriages just tend to discourage people from getting married in the first place.