I don't think it had to do with editors. I did think the lack of chapters was weird when I started reading Terry but I soon got used to it, then embraced it was it really suits how I read, often reading 80 pages a day (whilst at work no less!)
As a projectionist I tend to read when I am wandering the long projection booth from end to end throughout the whole day or with it pinned to the bench while I make up a film!
So I tend to read by the paragraph!
I haven't got as far as the the books with chapters yet as I am only halfway through The Truth at the moment. If the are part of the Victorian style/nature of the books then I welcome the change, just as a director, known for a certain style, can change their style to suit a different kind of story.
Don't know if this has been covered yet but has anyone discussed the meaning of the sections in CoM, LF and Pyrimids, as they don't really differentiate why the breaks were in those places. Especially Pyrimids. Maybe I'm dumb?