Originally Posted by
HTupolev
It's certainly a part of it. Another reason for achieving high trail with a slack head angle is to create a large front-center, to keep the rider feeling "behind" rather than "over" the front wheel without needing to use a problematically-low bottom bracket.
Couldn’t you just lengthen the top tube and keep the steering angle the same, like Cervelo did with the Aspero? Front end geometry is the same on the Aspero as it is on the Stigmata, just with an extra 10cm added to the top tube.