I don’t agree with you about textpattern (Neither does
John Hicks, one of the most reknown designer on the web... notice his website is txp powered...), it’s as easy to customize as it is with MODx. To me, you can not compare with Movable Type, which is way less flexible.
There are many similarities between MODx and textpattern, as far as design capabilities are concerned.Take chunks in MODx : they are very much akin to Forms in txp... I don’t have time to develop right now, but I felt at home instantly with MODx because its logic is so similar to Textpattern.
The thing MODx has that textpattern does not is Template Variables and illimited hierarchical structure, on this I agree... it means more flexibility to structure information. But here we’re talking information design, not web design (I know this is an intellectual posture but hey, I like clarity...)...