I’ll argue here that, while the Technology on the Horde does get played in a poor light more often, in general that is part of a broader subject of just about ‘everything’ getting treated in a darker / poorer light in Horde cities. From the quality of living, to the safety of their lands, to the output of their agricultural production. While a good bit of this is rooted in older depictions of the Horde that have not changed over the decades, I do not think that it speaks to an overall trend of technology being wholly bad in the Horde.
Especially with new developments in the Horde over time, we have seen a decidedly improved relationship between the Horde and technology, especially as the various races have moved forward in their stories. (The rare times that occurs). It is also seen more prominently in the races that have joined the Horde in more recent times.
The Horde has plenty of technological marvels and pieces that have helped secure the safety and prosperity of the Horde, and are generally portrayed as ‘safe enough’ as well. From the Engineering marvel of Thunder Bluff, to the ever increasing reliability and performance of Zeppelins, and new steps forward in naval technology with aircraft carriers from the Mag’har, and the new Ship of the Line vessels from the Forsaken. The goblins have their X-in-a-box technology that, while rarely deployed in the narrative, is a powerful asset in setting up towns, forts, trading posts, or just about anything else they wish to place in a box.
The Rocketway, Telemancy Networks, Zeppelin routes have all proven to be incredibly effective, with Telemancy generally being portrayed as superior to regular teleportation magic in broad terms. Zeppelins, as well, effectively give the Horde stable and speedy transportation lines with relative transport speeds over the ocean that are far faster than what sailing ships would be able to accomplish given their current technological level.
(As a comparison: Hindenburg could cross the Atlantic round trip in about 98 hours. A sailing ship took between 1-2 Months. Even steam ships in the early 20th century were taking around 15 days) The Zandalari are shown to be master builders, and skilled shipwrights comparable to the Kul’tiran shipwrights as well.
The Shal’dorei in addition have been able to sustain themselves with food and water largely through magical means through thousands of years while beneath the shield around Suramar, and that knowledge should still be with them to this day. Not only that, but Highmountain, Zandalar, and however much of the Drogbar territory now falls under Navarogg’s control are all insanely resource rich and could provide the fertile grounds to prop up any expansion of Horde supply chains.
The Horde has plenty of advantageous technologies that could be applied to their prosperity, and in my opinion would have been applied in a story that paid more attention to logistics than Warcraft often does.