I guess i didn't explain very well my point i think because of my inexperience with designing websites and using cms's in particular.
Apeisa, for what i've seen we really can't compare drupal and Symphony in terms of simplicity and control. In Symphony you never have to think how you can remove something, you always have to think how to had it instead. It's core it's also very small and only few extensions are active by default. This is why I think we can compare it with Processwire although they are so different in other things. I won't try to explain how Symphony works because I will be unsuccessful again for sure. But maybe I can tease you both to study it a bit, and discover how it has some really nice things that could give ideas to make Processwire even better.
Ryan, maybe you got it right about the forms, although I was not talking only about them. One of my concerns is how the editor will interact with the back end... and, while the tree view is perfect for building the website, I think it would be nice to be able to organize the the content for the editor. I mean, some people could see everything, others only some pages, while others would land directly on the new blog post page (like in textpattern, for instance).
Since I also referenced the debug tool in Symphony, I was also thinking how Processwire could have something similar (an idea for a module maybe). In symphony, if you add '?debug' at the end of any URL it shows you all the XML data that you can access from that page, and it let's you try XPATH expressions highlighting the nodes that you reach with them. I can imagine that in Processwire we could have all the results of each field shown, and an imput field where we could write some variables and have the generated results.
Hm... this discussion went quite far away from the Breadcrumbs subject. Sorry for that.