I'm unaware of humanity in our modern day of tech being able to create giant mecha suits capable of firing lasers, performing aerial combat, and commanding robotic drones to fight for them. I would consider 21st century human tech to be leaps and bounds beyond medieval tech. Wouldn't you?
Blackfuse's tech wasn't junky or explosive (unless he wanted it to be). He was also capable of reverse engineering Titan and Legion tech. So I think you're over-generalizing Goblin style tinkering.
Really? Then show me where Gnome and Goblin Hunters are using lasers, mech suits, gravity bombs, and energy weapons. I can't find it on the ability lists.
I'm talking about playable classes, not lore nonsense we don't have access to. Enhancement Shaman are Battle mages, as are DKs.
Iron Man uses nano-tech in 2 Avengers movies. Before that he didn't use nano-tech. Further if we look at the actual Tinker abilities and concept (both WC3 and HotS) it is highly futuristic for the otherwise medieval setting.
Put a Gnome or Goblin into a mech suit like this;
Give them abilities like Buster Cannon, Deth Lazor, Grav-O Bomb, Gigavolt Charge, Xplodium Charge, etc.
I would even give them a few aerial abilities like dropping bombs/firing lasers from the sky.
Iron Man would be the closest equivalent.