The WPF system is hierarchical rather than constraint-based. I've done a variety of complex (I mean really complex) WPF layouts that need to scale, and they're complex and fiddly. In many cases I would rather have had a constraint system. When you try to align things to a layout grid in any way, for example, it becomes very awkward.

But it's not clear to me constraint-based layout deals well with dynamic content; this may be a tradeoff.

How so?