The problem with Gnomes and Goblins, and by extension their tech, in WoW is that they are overly cartoonish with almost zero moments that treat them seriously in the scope of the story.
Arcane had a “Gnome-like” character found in Heimerdinger, a short whimsical character who, despite his small stature was taken seriously for his wisdom and hundreds of years of experience. He was a multifaceted character and his inclusion in the story did not break the tone, because he did not act like the Comedic relief.
Furthermore, the steampunk technology was not treated as some side thing to be ignored until it was convenient to use. The story is about the implications and consequences of invention. The technology was treated with respect and explored in-depth.
Meanwhile Steampunk technology in Warcraft looks like it’s barely holding itself together and is about to fall apart any moment. Reinforcing the comedy, and making it feel out of place.
Whatever Blizz has planned for the future, I think that WoW should seriously explore both the Alliance and the Horde expanding upon their technological capabilities.
Giving opportunity to examine each Faction’s philosophy about invention. Something that would be interesting for a franchise called “War Craft”.
We got a taste of that when Gelbin had a radio activated bomb to destroy a fleet.
Also remember, that the Gnomes had nuclear technology, which was crucial to the downfall of their home.
There’s obviously a lot of narrative potential around technology.
Before the Worgen curse, Gilneas was a society with a Victorian level technology. So it’s clear that humans are not dumb or universally stuck at medieval levels.
It stands to reason that a society composed of Humans, Elves, Dwarves, and Draenai might encourage a culture that is driven towards invention.
Or working to understand Titan technology.
Alternatively consider the possibilities of inventions made in a collaboration between Alliance and Horde, or a group of people from both factions who have a neutral ground - what would the implications of such a thing be?
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Additionally, consider that both factions are getting Earthen, the pre-dwarves.
Increases both factions capabilities towards invention
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Gameplay wise, some may point to the possibility “Tech class” - but I’d say that there’s be potential for new types of weapons.
Imagine if the different classes, at least the melee centered ones, got unique firepower weapons.
It’s a world with literal Air Ships so why not?
Stop treating the Gnomes, Goblins, and steampunk as Comedic Relief.
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Side note, give Mechagnomes more robot customization options.