yes exactly, you just clicked the point!
seam suffer strongly from maturity of Apache open source,
it is more like rapid implementation of ideas,

I think when JSR 299 becomes finalized and ideas become mature,
and better implementations become available
it will become much more usable,
but even at it current state I found it more useful than other Java EE 5 web frameworks.

at version 2.0.0GA (not latest 2.0.1) most of the bugs are minor, and not much annoying.