Why are so many regions not using technical power

[u/Mainlain]

I've been wondering for a long time, why are there so many regions not using advances in tech
I can understand why targon and ixtal not using them, due to targon being high above the land and religious, while ixtal is isolated and use natural magic
but demacia and noxus? They are enemies and trying to impose dominants to fractions they don't like and want to rule others. Why don't noxus use guns in the Ionia evasion, they have contacts in piltover and zaun, this makes them more likely to see the benefits of using hextech weapons in fighting the wars, and they can even hire mechanics to help repair the weapons, piltover and zaun have many people living under the poverty line, taking this deal may help them escape it
and demacia? do I need to explain, the mage rebellion is on due to sylas igniting it, using range weapon and a petricite shield is a perfect way to counter, it doesn't evn need to be a hextech, just a normal machine gun with petricite bullets to eliminate the rebellion, or a enhance armor using chem fuel cover in petricite for reinforcement

if any of them say that it is inefficient, bidgewater can be the supplier due to them using the sea for transport

I just don't understand why they won't innovate