Perhaps a change to the "class fantasy" of a Tinker is what it needs to be added.
I'm sure Blizzard doesn't want to hear consistent criticism for years on end if they implement the Tinker as class based on the already established lore and theme around them.
Instead of this:
And this:
...they instead should move the fantasy of a Tinker to something completely different.
I pitched something a couple of years ago to be a plot device to enable all classes to be Tinkers, instead of just Goblins and Gnomes. That was that when you create a brand new Tinker character of any avaible race, you wake up in Ironforge/Orgrimmar and you a wounded soldier from the most recent "Blood War" but you are so wounded you can no longer be a soldier. Could be amputated legs/arms or whatever.
So you learn to weild this new "mech technology" that gives you a mechanical suit for you to use on the battlefield and you can serve your faction once more.
I got the idea from the "dragoon" from Starcraft.
Something like this is a brand new take on what we know Tinkers are, and if not this directly, what else?