I would encourage everyone to read through this excellent page on LEM:

Innovative Macintosh System 1.0

For those of you not interested in reading all the content (lazy you!), just search for "glaring omissions" to jump to the pertinent info.

Another interesting note is the fact that LEM mentions the Shutdown command came on the scene with System 2.0. However, this April 1985 MacTech Mousehole mentions (mistakenly, I assume) that Shutdown came about in "Finder 2.6" -- which is a version I've never seen before. Search for "New Finder 2.6X Features" on that MacTech page to read the comment.