Yeah I understand that, but no one generally does. I guess I just don't see why it would be such a pain to make it required. I mean it takes all of 10 seconds to click on the game and go to manage game. Actually probably more like 3-5 seconds depending on level of hand eye coordination. But even if this extra 5 seconds is unacceptable to you to be required, at least having it as a drop down or something in the walkthrough creation would at least remind people to add it. I myself have 5 walkthroughs published with a half dozen in the works, and although I tend to keep a pulse on the games to see if they get updated and change the WT accordingly, my WT's themselves don't even have the patch versions.
And you're right that it wouldn't tell any differences, but at least if I ran into a roadblock that could be the first step in realizing that something's wonky.