As TheMysteriousGX and Silvanus point out, this is setting-dependent and doesn't actually make sense in a lot of fantasy worlds.
For this to be a valid argument, a given setting must be exceptionally low-magic, low-resource. Real dark fantasy shit. Like, "let's make a grimdark Hyborian Age" stuff.
So...Dark Sun. That's it. AKA, the setting WotC/Hasbro won't touch with a 50' pole because it was deemed
Too Problematic for Reprint! The Brom artwork was just the tip of the fuckin' iceberg on that one, lemme tell you.
Greyhawk is the next-lowest magic setting in D&D, and every last bit of what I just mentioned with the exception of artificer content, is valid there. Faerun is the default campaign setting for 5e. Faerun is so explicitly high-magic
it has its own magical Amazon equivalent where magical items can be mail ordered via magical catalog, and teleported directly to you. Aurora
really stepped up her game, from back in the day when the Emporium was merely analog to Sears & Roebuck.
I don't have the Eberron supplement which much of this stuff you cite comes from. But that's the thing, isn't it - Eberron has a specific setting. We're both arguing setting being important, but you're the guy attempting to pretend it doesn't matter whenever it's convenient to you and so has a problem with logical consistency. You would do well to think on that before you accuse others of weaselling out of arguments.
Well, it's a good thing
artificer content isn't Eberron-specific, and Eberron isn't the
only setting in which artificers exist. Far from it, in fact, as
the world explicitly separated from the rest by divine mandate and completely inaccessible by spelljammer has its own population of artificers.
The "Siri, define irony" part of all this, of course, is you're over here
attempting quite possibly the most laughable, flaccid,
reductio ad absurdum I've ever seen on these forums, talking about flying broom air forces. One of those published settings has
dragon-rider air forces, and as if that wasn't enough, the dragons wear magical barding and have dual saddles so a wizard or cleric can ride shotgun with the dragon-riding mounted knight, who wields an artifact itself capable of being mass produced. And, those air forces are explicitly the main draw of the setting around which entire goddamn book series' were written.
That happens to be one of the oldest published settings in D&D altogether, twenty whole-ass years before Eberron saw print.
Now who was saying what about setting and consistency, or are we just reduced to indignant fart noises now?
In one sense sure, but it's also like arguing that nobody should be using wheelbarrows because excavators exist. Which is doubly weird because the Battle Wheelchair concept that sparked this whole thing was also an explicitly magical construct.
So the problem is literally just the wheels
More to the point, it's adding a wheelchair and ramps, and proceeding to expect cookies while all the other virtue signalers seal clap and wank over the cracker, acting like this is some glorious new era of inclusivity and acceptance for D&D, whilst solutions to these issues are baked into the game and have been for years, some of which dating back to the game's earliest iterations and editions. It's a fucking massive fake problem circle jerk so people can feel self-righteous about "fixing" it.