And Tinkers don't formally have connections to titan tech. Dragonsworns would have just as much connection to Titan tech if we're talking about some machine that has connections between the Titans empowering the original 5 Aspects. Tinkers aren't masters of Titan Technology, and we have characters like Brann and Muradin who are able to interface with Watchers and Titan tech without any expertise in tech.
Then that's a big what if that doesn't really have anything to do with Tinkers, other than to shoehorn them in.
I could suppose the same thing about Shadowlands. We know Bolvar has a connection to the Shadowlands and may be able to open the gateway for us to enter.
But what if he isn't enough? That's where Undermine and the Tinker's Union could come in.
It's general enough that you could apply it to any expansion, and it's the reason why I think Blizzard isn't going to take that particular route. It doesn't actually connect Tinkers to the storyline, it just connects them to the entry-point to an otherwise completely unrelated expansion.
What happens after the Titan tech is figured out? The rest of the expansion would still be Dragon Isles related without the need of any further assistance from the Tinkers. The Tinkers don't have any roots in a Dragon Isles setting and story, you've already proposed that this would be focused on Dragonsworn Covenants.
Think of it this way - if the fantasy is all about playing a Tinker, then as a player I meed to clearly understand my role alongside other classes. What is my motivation for fighting for the Alliance and Horde? There's plenty of ways to tell this story, to explain this purpose.
If you boil it down to a story mechanic of 'Well you join the Alliance and Horde because they needed you to unlock Titan Tech in Dragon Isles and make teleporters to Undermine' then it's a pretty generic and bland introduction.
If I'm literally playing a new class because I'm a 'key' that opens up the door that leads to a place that has nothing else to do with me except 'transportation maintenance' then it's very lackluster. And the more tech you'd try to toss into the Dragon Isles to substantiate a Tinker, the more muddled the concept of Dragon Isles overall; same thing if we were applying this to Shadowlands and having Tinkers be the ones responsible for the portal between realms. Shadowlands and Dragon Isles aren't ideal locations for heavy Tech themes that can carry a Tinker's purpose beyond opening the door.
The issue isn't using tech to fix problems, the issue is Tinkers being completely disconnected from the setting
of the rest of the expansion.
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I doubt we would have had both a new class and Covenants that cover the same themes of said new class.
Plus the devs pretty much said it themselves, that they forgo a new class for the reasons of wanting to focus on building the world of Shadowlands. To me, that implies exploring the various Covenants.
https://www.polygon.com/interviews/2...ll-human-dwarf