I'm no rioter, but I can at least make some discussion here, if you'll indulge me:
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Ionia's likely filled with natural magic and as such is easy for Ionians to draw from. My current line of thinking is that Ionia wasn't involved in the Rune Wars, and as such their natural magic reserves were never depleted or harmed by such conflicts as it probably was in Valoran and the southern continent. I'd say it's highly likely that Noxus invaded them because of this, as Noxians are very much about power and strength, and so conquering a land filled with magic to use and abuse would be great for conquering the rest of Runeterra.
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I feel like this has to do with how humans evolved in Runeterra, considering the considerable amount of creatures that can be found on the planet with innate magic. Considering the origins of the human race in League is unknown, I feel like the true reasons behind humans not being born with magic in most cases won't be a talking point until then, although I would like to discuss that Ionians, given their land is filled with magic, might be much more inclined to being born with magic simply due to natural exposure, where as humans from Valoran and the southern continent are very rarely magical from the get go and have to find their power through other means.
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Noxus has been shown with grenades and guns fairly recently (Looking at Kled and his video thing), so technology like guns and cannons is probably more widespread than not. Looking at Earth's history sword fighting and guns were used in tandem for a good period of time before we transitioned in to almost entirely being gun, bomb and artillery focused in our military strategies. Hextech is SUPER rare because it uses magic as a fuel source and not being very abundant in anywhere other than Ionia, who've only just started making their own hextech creations during the last decade or so, but for Yordles, given their innate magic, likely can make what they want and power it via their own latent powers. I'm still entertaining the thought that folks like Heimerdinger created magically powered technologies which then inspired and pioneered the human field of hextech, though whether that's true or not I dunno.
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Given the dominance of human nations and the relatively closed off/primitive/mysterious nature of non-human sentient beings that inhabit Runeterra, there's probably a lot of really old and folklore based beliefs about them. Yordles are everywhere so people are probably at least used to the idea of them, while other beings like the Brackern, Marai and Darkin are probably huge question marks in culture, remembered only as vague myths and stories. The Freljord's really the only place in Runeterra where sentient organisms directly compete in any real way with humans, considering both Ursine and Frost Trolls have about as much success as humans in living up there, while only Minotaurs have really any presence in other areas of Valoran. I can see the Freljord as having a lot of racial tensions because of how harsh and cutthroat the societies and environments are up there.
Just some musings on my part more than anything.
