I don't think you read the answer properly. The response was "it's impossible to plan for" and your answer again is "you should plan ahead". And I actually do think the fact that you don't have kids does mean you don't know how hard it is. (It's like me saying I know the physical act of childbirth is hard, but I think it's certainly not the same as me going through it.)
Dwight Eisenhower famously said, "Plans are useless, but planning is indispensable." My point is that it is NOT impossible to plan for. Many aspects of having kids are quite predictable, including all the issues that the OP was asking about. I've tweaked the blog post a bit to hopefully make this clearer. P.S. And maybe I don't really know how hard it is to raise kids. It may well be even harder than I imagine. But t…
He seems like a smart and responsible guy. The logical conclusion that most of us would come to is that raising kids is almost always harder than one expects. Instead you somehow are convinced he should've rationally planned more. And you are so confident of this without knowing anything about how he planned.