Hextech in the World of Runeterra

Hextech is, as suggested by their name, magic-powered technology. It is the main purview of Two of Runeterra's most Prolific city-states, Zaun and Piltover, heck, even Bandle City has Corki and scients like Ziggs and Hermidinger. These are also the most advanced civilizations on runeterra (although arguably Targon now, but don't even get me started on that.) and they also have had an impact on the lore. Noxus used Zaunian hextech for their invasion of Ionia, and Singed, a famous Zaunian alchemist, helped create the chemical gas used in the attacks on Yi's village and on Riven's allies. the Ionians even reversed-engineered some of it, they already have companies and industries for them (that's how Jhin's patrons get him his tools.)

Now, Noxus and Zaun are allies or at least business partners. Urgot is the result of a collaboration between them, but this brings me to question something that I haven't really thought about, mainly, why isn't Hextech utilized by ALL factions on Runeterra? (the mortal factions at least.) Demacia and Noxus are stuck in the middle ages, using swords and crossbows (and magic.) However, both factions have alliances with Piltover and Zaun, respectively, so you'd think They would be advancing technologically. I can by the armor being enchanted in some way, but still, you'd think there would be an influence. We currently

Now, I know why they don't, rule of cool. It's just awesome to see someone like J4 fighting against Rumble's Mech with his trust spear. But I want to know how this works from a lore perspective. In real life, advancement doesn't just take a break, it can be slowed down granted, but never stopped. There will always be something that people want to be done easier, quicker, or better. More over, neither faction has a concrete reason for not using Hextech, Noxus has used it and doesn't seem to care about it. Demacia literally has not interactions with hextech (besides Blitz's PERV service, but I'm not sure if it is canon) and I don't know what their option is on it.

Now they can still have their knights in shining (or black) armor, but I would like to see something come out of Hextech for all factions. I mean, it opens up potential for a lot of stories and new characters, like Jhin did for Ionia. So, what are your thoughts on Hextech? Thank you for reading.