who complains about complexity of DITA?

Are we entirely clear about the use contexts in 
which users find the number of elements onerous or confusing? Obviously, the authoring environment is 
one.  But do architects also object? Do the tools vendors object? This 
seems less likely to me, but it's not something to guess, we should find 
out. And is that (the number of elements) 
the only complexity that they object to?

The 
constraints mechanism can neatly address the perceived complexity in the 
authoring environment. (Be it noted that existing 
mechanisms provided by [some?] authoring tools to hide elements from authors 
apparently do not reduce these complaints, maybe because the complaints come 
from users who don't make use of them.) But creating and managing constraints is 
another layer for architects and designers to deal 
with.

    
/Bruce