Gradine
The Elephant in the Room (she/her)
It features airships, which are generally associated with Steampunk.
I've played roughly... <does some quick napkin math> a bazillion JRPGs, and while quite a few of those might have been classified as "Schizo Tech" I can't think of a single one I'd really class as steampunk, and yet 99.9999% of these featured airships.
My immediate association with airships is Final Fantasy. I can kind of see the similarities between Eberron and FFVI if I squint hard enough, but FFVI was still "technology powered by magic" where Eberron is "magic is the technology".
Notably, Eberron lacks both the steam engine as well as anything you might consider clockwork, at least one of which I would consider kind of mandatory to qualify as steampunk. Also: no gunpowder.
I don't even necessarily consider that much more technology advanced than the typical D&D setting. The key distinction, as I see it, is that Eberron essentially asks the question: "But what if wizards were capitalists?"
Fun fact: the representative images of both "Magitek" and "Dungeon Punk" on TVTropes are from Eberron.