I am in no means attacking you, just some of your arguments :p
You're talking about applying pragmatism to art by bringing up metallurgy and agriculture, which I hope are pretty obviously not art.
Labeling a method of ending a story as "lazy" without some sound backing (good arguments) is itself a lazy affirmation. And that is because the personal preference of one or a few is in this case, and oftentimes, not an argument.
And the whole point that would stir me is really about using your preference to label a writing method as wrong (or lazy, but it kind of means the same here).
The feeling I get is that you never found a good story with a working open end (which, in my opinion, is what Dragon Commander's story is).
An open end has you building your own extension of the story based on what story was given to you. If you "cut out the middle man", you probably will never have the same universe, characters, situations, etc. to build anything similar from.
An open end is therefor an open field at the end of a road for each reader's mind to traverse. The road is what lead you to this particular open field to boot.
A story can choose to feed you the epilogue you so desire, or let you do it yourself. In itself, it's not a factor that one can use to believably brand a story as lazy.
I would like to mention that I am not an artist. I am not always right. Also, I'm not arguing preferences, as preferences are a very personal thing.