Most reach weapons described in this chapter double the wielder's natural reach, meaning the typicial Small or Medium wielder of such a weapon can attack a creature 10 feet away, but not a creature in an adjacent square. A typical Large character wielding a reach weapon of the appropriate size can attack a crature 15 or 20 feet away, but not adjacent creatures or creatures up to 10 feet away (PHB p113)
It doesn't to me..."appropriately sized" isn't a stipulation, it a distinction. All its saying is that a Large creature using a Large reach weapon has a different reach than a Medium sized creature using a Medium sized reach weapon, but with better word economy.
Hmm? To me it says that a Large creature using a Large reach weapon has a different reach than a Large creature using a Medium reach weapon. It doesn't comment on Medium creatures at all!
Read that section again- it is clearly a pair of comparative sentences showing that larger creatures get more reach than their smaller counterparts (not comparing large to large) and denoting that, just like in the medium creatures mentioned before, a large weapon cannot usually be used within the arc of the creature's natural reach (and specifically spelling out that this is 10' for a L creature as opposed to 5' for a S/M creature).
A Small or Medium wielder with Monkey Grip or Powerful Build is not "typical"- he can wield weapons larger than typical S or M critters can wield, in this case, a reach weapon designed for a creature one size larger than itself.
Certainly. And his space and reach remains that of a creature of his normal size category.
No, because he is not typical.
If you can read "appropriately sized" as being some kind of attribute/restriction on creatures, then why don't you then see "typical" as an exception?
While we're at it...am I correct in assuming you'd find that a Tiny Creature using a 2 hd reach weapon sized for a Small Creature (with Monkey Grip/Powerful Build) or a a Fine creature using a DMG Kusarigama sized for a Small creature (as a 2hd weapon) would get no reach?