What struck me about this quote is how WRONG it is

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In both 3rd and 4th edition point buy is the norm and abilities range from about 5 or 6 or so at the low end to 20 at the high end (after Racial Adjustments).
And thats just for starting characters. At higher levels stats in the mid to high 20's are common.
Heck, even in AD&D Strength ranged up to 18(00) for a starting character

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I disagreed with pretty much ALL of his examples of what D&D "is".
You are conflating how you generate the ability score with range of scores associated with said ability score.
True, if your experience is primarily 3e and 4e the bottom half of the 3-18 bell curve was not super visible to the players, but you will notice the tables for those ability scores don't start at 6 and go up.
Further, they are looking at the entire history of the game which is over 30 years and 3e and 4e encompass, what, A third of that?
I have played pretty much every version of D&D there is (discounting the multiple versions of the basic set in the TSR days) and I see what they are trying to do. They are distilling the core essence of what D&D is in the base rule set.
By focusing on what D&D is over the breadth and depth of its existence they are trying to make a tight yet flexible foundation that we can then build off of with "official" modular add-ons, possibly 3rd party add-ons, and in likelihood our own add-ons.
Sure, the 3-18 range for ability scores may not be your current experience in D&D, but will it impede your ability to play the character you want? If the math for the new system provides a near identical play experience for 4e but has an upper limit on the ability scores of 18 + racial mods and any magic you does that kill the fun in your game?
Is the high number of the ability score more important than what you can do with that ability score?
I ask these questions because Monte did not promise that you will be able to play 4e or 3e or 1e with D&D Next, he said you can emulate it by adding or subtracting modular rules.
Basically WotC is trying to teach you to look beyond the surface of the game you are playing now and examine the core experience of your game. All the rest is fiddly bits.
My Two Coppers,