SugarLabs: Sugar-sweet or Sugar-coated?
SugarLabs evolved from OLPC with a wider goal to provide an instructionist GIU and computer learning environment for elementary school age kids all over the world.
It's engineering goals call for an OS and hardware-agnostic platform, with transparent free and readily accessible and modifiable code that can be also easily shared among users. The normal user has absolute control over the Sugar part but the core system remains secure from malicious activities.
One aspect that was explicitly stated in the OLPC project but is not even suggested by SugarLabs is environmental concern and energy (code) efficiency. The other aspect that was not addressed either by OLPC or SugarLabs is if free and accessible implies "as long as you do it a certain way".
See original: SugarLabs: Sugar-sweet or Sugar-coated?