There's a category of rules questions I call "The Greatsword is not a ranged weapon". We know the greatsword is not a thrown weapon in normal usage, because it is missing the keywords. If you assume the rules are complete, it works absolutely fine. But some questions only make sense if you expect the greatsword to have a rule "this is not a thrown weapon". But really, if you read the rules as complete it is perfectly clear.
Read these.
It's clearly listed above. You can wear ONE.
Yes, you have expectations of more. But if you don't go in with any expectations, the rules are absolutely clear and there is no question.
Nor are any others listed, just the general category of ALL. It's simply making not that some thngs are described as a "pair" but are actually a single magic item.
Which tells you where, and is immaterial to how many. A hydra doesn't get to benefit from seven magical circlets.
Yes, you did. You quoted it.
Nope, because it's clearly listed.