I believe what he is saying is that it's a pretty specialized piece of equipment from a commuting perspective and a relatively expensive one that has questionable popularity even in its country of origin. If you have the space and a fair amount of disposable income, maybe it makes sense.

The thing to remember is that unless you have a lot of kids over a reasonable span of time, the useful life (for kid hauling) of something like that is pretty short. And is it worth the investment for those number of years that you'll actually use it before the kids are starting to ride on a tag-along or their own bike?