The thing is, though, I don't think it's an example in the way you're using it. I think you've reached your conclusion, and have been looking for stuff (present or missing) to justify that conclusion.
I don't know what to tell you. i wasn't even thinking about 4E when it happened. I was, as I said, perusing the 3.0 DMG, mostly trying to decide whether I wanted to work with 3E or 2E to try and get a game off the ground, and ran across the section on asian weapons, guns and lasers. I literally stopped reading and ran to get my 4E DMG and check and see if there were guns in there -- not because I was looking to take a shot at 4E, but because as much as I don't like the way the game is built from the players' rules perspective, I do like the 4E DMG (both as a guide to running a certain kind of D&D and from a technical, utility perspective) and I wanted to know if that little tidbit that has always been there was in fact there in the 4E DMG.
Like a lot of folks here, I have been gaming for decades, the majority of it with one version of D&D or another. Modelling guns/lasers/cyborg dinos in the rules isn't the issue; me personally needing to be told it's okay to have guns/lasers/cyborg dinos in my game isn't the issue. I am a verteran gamer. I can do those things and not feel bad about it.
The issue -- and I'll try and use a little less hyperbole now that it's not 2 AM -- is simply that 4E feels more limited, more tightly focussed, more gamey and less simmy in its core set than any other edition. For me, obviously, this is a bad thing. And just as obviously, for some it is a good thing (likely because they prefer the style of play and scope of meta-genre 4e aims for and hits dead on).
I don't hate 4E, i just don't like its focus. If a 3rd party publisher or WotC provides some well written, well designed book that shifts or broadens the game away from the core's tight focus on cinematic action/tactical skirmishing, I'll likely run the game. When there's a collection of classes and/or powers that differentiates characters and roles more, that supports my preferred play style, I'll be happy to become a fan of the game. It just seems like something of a waste to try and shoehorn 4E characters, as they are designed in the core, into the kind of game I prefer to run. That's not an attack on 4E, it's just a fact of where my preferences and those of the designers don't mesh particularly well.
And ultimately the only reason it troubles me is that it's easier to find people to play the current edition of D&D than it is to find people to play an older edition. Not objective, I know, but whatcha gonna do?