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There was probably a weasel-speak answer. I'd wager that reading between the lines it felt similar to, "we changed how to use measure because we felt like it".
That Show/Erase config change isn't the only thing causing frustration in the Show/Erase world. I've yet to have any user hear how Show/Erase works now and say "oh, what a great idea!" Instead, when I explain that they can Show a dimension, but if they then Erase it, they can't use Show to show it again, they have all looked at me questioningly. When I explain that now they have to go find the view in the drawing tree that contains the erased dimensions, expand the node, right-mouse-button, and unerase the dimensions in question, they look at me like my IQ dropped to a negative value. That's usually followed closely by Pro/Fanity, that module that comes free with every install.
Now I tell them just to delete shown dimensions. Even though you couldn't do so before.
In Reply to Lance Lie:
David,
I agree on the Show Erase Config Option 180 flip in Creo 2 from WF4/WF5.
This was a lengthy discussion at the TC Meetings in January 2013 at PTC. I
forgot what they said was their reasoning. Sorry, I was so disappointed at
the meetings that I was actually doing work instead of listening.
Lance J Lie