Omitting Others? A(nother) case for Dogme

During the last few months and to an extent the last year or so there have been a few bits and bobs about diversity in ELT. Two examples off the top of my head are:
The queering (or actually not) OF ELT materials by Angelos Bollas (talked about at Innovate ELT 2016 and this year’s IATEFL). 
Emily Hird’s post on diversity in ELT materials (by big publishers). 
All of this leads me to believe that one OF the best tools we have at our disposal as teachers is Dogme, going materials light. This gives greater opportunity to go to places prompted by the learners and teachers rather than hem in conversation by implicitly suggesting a norm in a textbook. 
A case in point would be the usual heteronormative, racially homogeneous family tree. One might get into hot water from bosses in very conservative institutions. If the work is learner centred, the basis of learners’ families is the basis of discussion. The way other families are portrayed on TV and in movies often come up in questions. How many learners have divorced parents? Step-siblings? Half-siblings? LGBTQ relatives that are married or living together? Heck, even straight people merely living together is risqué on coursebook land.  That’s just an example of what could come up when talking about one topic.
If you have a diversity problem in your materials, are you sure they aren’t overly simplistic? If they are overly simplistic in diversity, as well as language that learners may require  to meet their communication needs, why are we pussyfooting around the deficiencies of expensive dead trees and not instead boldly using our learners’ lives to teach real life.