Worth's quest to reduce Oberon's usability to a language without the libraries and related OS infrastructure that made it interesting to use in first place?
References for your claim that "The whole point of Oberon was the Smalltalk ... Mesa/Cedar like experience." and "It is definitly true for Oberon OS System 3." I was at ETH until 1993 (and then again from 2000 to 2005 for my PhD) and have other information directly from the sources.
No magic, just facts, Luke; don't search too long; look at the introductory sections of "Project Oberon, The Design of an Operating System and Compiler" (ACM 1992), "The Oberon Companion, A Guide to Using and Programming Oberon System 3" (vdf 1998), and Gutknecht, J (1994): Oberon System 3: Vision of a Future Software Technology, Springer, Software.