This is one that kind of bugs me. They really ought to be separate skills.
Moot point, they never will.
Still doesn´t change anything about the fact, that dexterity/agility is main requirement for wielding swords, not strength.
Still not a fact as that cannot be feasibly proven.
What?? That’s like debating about politics with my communist grandpa lol…
Dude, it’s a naming convention.
Also, no. Dexterity is “skill in performing tasks”, not “a skill”.
And skill is “the ability to do something well”.
That said, one could also argue that they’re all synonyms.
dexterity – synonyms: deftness, adeptness, adroitness, agility, nimbleness, handiness, ability, capability, talent, skilfulness, skill, proficiency, accomplishment, expertise, experience, efficiency, effortlessness, slickness, mastery, delicacy, knack, facility, artistry, sleight of hand, craft, finesse, felicity.
“…and in games, they are generally fixed. In reality, they are not fixed.”
And aren’t we talking about a game here?? 
“Henry is one fairly generic person that everyone will play as. We don’t choose his stats…”
Ahem. I think the developers disagree with you.
.
Stats*/attributes and skills aren’t mutually exclusive. They already have agility listed among the stats (which, I assume, is necessary for both fencing and archery – which are trained very differently), so why shouldn’t there be a dexterity stat? Ah, because it has been replaced by agility – okay, I can accept that argument, though I dislike it (that’s why I started a thread on this topic in the first place).
But following the reasoning you have expounded, then all attributes from this game (strength, agility, charisma) should be removed, – like it’s the trend in the current generation of RPGs.
*I use the term stats (statistics) because that’s the way they (attributes) are currently named in the game, though it’s a misnomer.
Frankly, I would rather have the whole character development part thrown out the window, for one simple reason: it is completely unrealistic. The main character learns in a couple of weeks or maybe a month what would normally take from months (plural) to years to properly learn/train.
Yes, taking the stats out would turn this into a different, more action/adventure-oriented game – but a slow-paced, realistic one, with lots of dialogue – and it would also require a different story (the main character would need to have his learning and training at least half-way completed when the game’s narrative begins). … Anyway, these are just ideas; I doubt they’ll change much about the story and mechanics at the current phase of development.