I am at this moment making my own chain mail for a live event... I think I know what I'm talking about when I say that if it's done right, it's almost weightless...
If you do it right.
There is a technique which make the whole mail shirt support itself. From there, all you need to do is to support it from your shoulders and it's pretty much like wearing a metal t-shirt... Not really cumbersome. And far less that what a real full plate would be.
The whole point here is that, if you go to the wiki link posted above, the full plate could be as light as only 20 kg (45 pounds) if well made of tempered steel. There is two key words here: well made and tempered steel. And while I am pleased to read about the exploits of reenacters, I seriously doubt that such an end result was common place in medieval time.
Competent armorsmith were extremely rare, and steel, even though the recipe was known, was so hard to produce due to availability that it was extremely rare to see. Thus, I really don't think "normal" full plates were made in majority with such a material, which would make them way heavier than 20kg.
Chain mails are made of rings of metal which absorb the hits because all the links are free and they move together when they get hit. Chain mails are also particularly usefull against arrows, as long as the bow is not strong enough to cut thru the rings (some longbows and pulleys). Not only is it way lighter than a full plate because the whole shirt consist of hollow rings but you don't need the same thickness for the mail to be effective.
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I don't see how this qualifies as "small plates strapped to the body". It's more like an unpowered exoskeleton.
Please read again the very link you posted:
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Plate armour could have consisted of a helmet, a gorget (or bevor), pauldrons (or spaulders), couters, vambraces, gauntlets, a cuirass (back and breastplate) with a fauld, tassets and a culet, a chain mail skirt, cuisses, poleyns, greaves, and sabatons.
That's quite a lot of pieces, don't you think?