The Spanish edition of the study was turned into a single edition a while back. This uses simplified language. This same approach is being implemented with the English language version.
The reasons?
Firstly there is only one document to produce. Less cost.
Secondly it means that ideas are presented in a way that can be easily assimilated. You'd think that simplification would fail to satisfy those with some intellectual capacity but I think the evidence is that people like having this stuff on a plate. Those who wish to have a pseudo intellectual toss off session over things when answering, having private conversations or posting on jwtalk can still do so.
Thirdly it paves the way for a future reduction in the meeting length and/or merging with the CLAM workbook.