You're not really talking about commitment. You're patting yourself on the back by putting other women down. The subtext of your posts is: "I managed to keep my marriage, so anyone who didn't must just be oversensitive or unwilling to try". That isn't fair, and it isn't true.
People aren't throwing away their marriages because they're "too sensitive" or can't be bothered to talk. They're leaving because they've already tried talking, often for years, and been shown it makes no difference. When they realise that every attempt to explain how they feel ends in dismissal, minimising or arguments, they eventually stop wasting their breath. Their silence isn't laziness. It's how they protect themselves after their partner has taught them that their words don't count or will be used against them.
You keep saying you "talked things through" and "worked it out". But the only reason that worked is because your husband did finally listen and change when faced with an ultimatum. That's not some magical skill in compromise on your part. It's simply that your partner was willing to respect you enough to act. That is exactly what is missing in so many of the stories women post here.
The truth is, if he hadn't changed jobs after you pushed the point, your marriage would have been one of those you now sneer at. You'd have been just another woman saying, "I can't do this anymore". You weren't different. You were lucky.
So no, people aren't abandoning decent marriages over nothing. They're walking away from men who refuse to pull their weight, refuse to take them seriously, and refuse to change even when they know the harm they cause. That isn't over-sensitivity; it's just common sense.