Maybe it's a throw-away comment but I think that sometimes it can be helpful. Sometimes we need validation of our decisions. We can say that we feel secure enough in our decisions, but I think that's often a falsehood - because we are all here nutting out our parenting issues and seeking in some way or another to validate the choices we've made. (By either arguing against someone or agreeing with them.) I don't much like cliches, but I catch myself using them sometimes if I think it is something someone wants/needs to hear and I agree enough with it to give it to them. I don't see the harm in validating someone's choice when they need it. And if a cliche is enough to validate it, fine. (I'll also acknowledge here that there are some situations where the cliche is not enough. Then as a community we should be challenged to say more and be more supportive.)
If we are confessing to overused phrases we dislike I'll admit that I get really shirty when I read, 'this too shall pass'. And I read it on here heaps. Personally, it doesn't give me any comfort whatsoever.
So I guess we're all different in the type of validation we need.