These are curiosities, and departures from the norm of the Greyhawk (and Blackmoor) settings. The very thing that makes them somewhat interesting is their novelty. In fact, I'd suggest that you've scuttled your own argument by even citing these as an example.
Then your suggestion would be way off base.
Historically speaking, psionics was possessed by about 90% of the entries in the 1Ed Deities & Demigods, all of the greater demons and devils, and many other critters in the MM2, Fiend Folio and Monsterous Compendiums. Oh yeah, Brain Moles, Intellect Devourers, Mind Flayers and Thought Devourers are also some old school faves as well.
It was rare only in the sense that it was hard for PCs to get any psionic ability. Considering the proliferation of psionic critters, the rarity of psionics in PCs was almost criminal.
Techno stuff is no more rare than other high end unique magic items- Lolth had her own starship, for instance. And the Modrons are clearly mechanistic.
Peruse some of the 1Ed & 2Ed monster entries, and you'll even find SENTIENT constructs, precursors to the Warforged of Ebberon.
Again, irrelevant. A golem NPC has limited "screen time", whereas a tin man PC has constant "screen time", such that it alters the tone of the game in a way that a single NPC (or even a race of them) is unlikely to.
Your objections seem to be more based on 3.x's expansion of the concept of PC race to include life forms that were (in previous editions) NPC only. It would seem YOU are the one that has the problem with the current system.
And both propositions are demonstrably false, or at least, not as true as you'd like to believe.
It appears that you're making assumptions about my argument because either you don't understand it or don't want to entertain it. I'm not saying these things don't belong to fantasy, just that they need to be handled with care before going "prime time" with them, because they bring flavour implications which you are seemingly blind to. Maybe you wouldn't think twice before adding laser rifles to the PHB equipment list, but surely you can see reason that some folks would? Not even Blackmoor has that. Why? Because they're there as a cross-genre novelty, of course, and don't fit Blackmoor except as alien artifacts. Eberron's tin men would look just the part toting them, though, which says it all, really.
Zander was the one who implied such concepts don't belong in fantasy at all, not you- I was clear on that when I posted.
I understand you just as thoroughly- I just disagree with you. Deeply. You just think that anyone who wants to meld "sci-fi" concepts like psionics or intelligent constructs in
D&D in particular is guilty of wrongbadfun:
rounser
Sounds like you need a game that isn't D&D though - that's the real problem here, too many jaded folks who can't move on to another game, and so are attempting to warp D&D into a pulp noir sci-fi paranormal mutant ninja turtle kitchen sink mess. From that perspective, you're the ones who need to move on - D&D doesn't meet your needs, and having it turn into some cross between Indiana Jones and Shadowrun, with extra added dragonsauce on everything would? Sheesh. Gimme Conan over that any day...at least his genre is coherent.
That is very different from Zander's position.
I'm not blind to the flavor implications of anachronistic items or technomagery. 90% of the D&D I've run or participated in as a player has had NONE of what you're complaining about.
However, I had no problem whatsoever running or participating in campaigns that feature such things, even if its prominently. If I wanted to add something like a laser pistol, it will always be for a reason, even if its just a red herring. I don't add things just "'cause its kewl!"