I have never ever ever heard of Drama being for the kids who don't do Lit. Literature has been a compulsory subject in every school I've worked in. If lazy has only taught Literature to 'more able' students, it would explain A LOT.
I got an A* at GCSE (sorry, whippersnapper of only 12 years experience here) and I know that what they have to do now is WAY harder than what I had to do. But we read loads of texts, even some we weren't going to be tested on. This is because the syllabus was smaller and manageable enough to spend time doing that. There isn't that luxury now.
The point also really needs to be made (if it hasn't been already) that English teachers are under enormous pressure but that the pressure is to achieve targets for the ENGLISH LANGUAGE GCSE. This is because schools used to be judged on the amount of students who achieve 5 or more A-C grades, and now they are judged on the amount who achieve 5 or more A-C grades INCLUDING MATHS AND ENGLISH. English teachers have to get them through both, but senior management only care about the Language grades. In that system of course you choose the shorter book, for your lower sets at least. (I said shorter, Lazy, not easier!). Of course you do. And let's not forget that as well as that set text they are all also studying Shakespeare, poetry, a modern play and a modern novel on the existing syllabus, all of which they will be examined on. Non-teachers, please put yourself in that teacher's shoes, in front of a class who may also need help with writing, punctuation or general comprehension just to pass English Language. You can see why we are in the position we are in, surely? You can see why we feel the way we feel?