Point of Order: Eberron is not Steampunk. It is magitech/aetherpunk.
If we're being accurate, Eberron is best summarised as "industrialised magic". While it's certainly not steampunk, "magitech" and "aetherpunk" miss the nuance of Eberron's approach.
Semi-serious question - magitech - could you do Final Fantasy 6 in Eberron?
I've only played Final Fantasy 7 and 8, so I can only go by what I've read about 6. Eberron and FF6 are
superficially similar, in that they share trappings like airships, but the specifics are important to what makes Eberron distinct, to my mind. To explain, a comparison:
Steampunk tends to take technology of the Victorian era and explain its function as broadly the same, but being powered by steam, regardless of the feasibility. Clockpunk does similar but with clockwork. Magitech/aetherpunk typically has technology being powered by magic. Eberron, however,
starts with D&D magic and applies the industrialisation process to it.
For example, the real word had the telegraph. Steampunk would have the telegraph with the electricity required to run it being provided by steampower, meanwhile magitech would have lightning spells providing the electricity.
Eberron, however, isolates what the
purpose of the telegraph was (long distance communication), looks at what spells and magic items provide that in D&D (Message, Sending, sending stones) and applies industrialisation to it to get the end result. In this case, the House Sivis message stations containing
speaking stones.