Plate armor was little more than a passing trend in real world warfare, relatively speaking. It was never the norm; the elites would wear it, but it wasn't something you'd see on more than ten percent of fighting men at most.
Other forms of mail were, of course, far more common because they didn't come with the practicality problems that platemail came with, but, again, plenty of cultures throughout history fought just fine without them.
Im sorry but you're dead wrong. Plate armor was the absolute best armor you could equip yourself with, it wasnt the norm because common men at arms couldnt afford an entire suit. Mail worked fine for cutting weapons but was pointless against stabs, arrows, and blunt weapons. all of which would be stopped by plate armor. The only reason plate armor died out in the 18th century was because of gunpowder innovations.
Practicality problems is another thing i dont understand. It did not slow movement, it did not hinder movement, fatigue was the only issue. I dont get what practical issues you're talking about
Plenty of cultures may have done fine but in the late medieval period plate armor was a game changer, to deny plate armors effectiveness inferring that it was only a trend, is ignorance, i mean that in the true sense of the word, not as an insult.