I don't know what size I "should" be. Any decent pattern will provide the actual finished measurements as well as the size labels, and I use that. I just take my bust measurement, add 1'' or 2'' or however much ease I want, and find the appropriate size. If that comes out to "S" or "M" or "XXXXL", fine, whatever, I use that letter for that pattern. I can live with using a different letter for a different pattern. So there's no way in which standardizing sizes makes things better for me.
And I can see how it makes it worse.
Their bust sizing chart goes up 4'' per size: S is 4'' bigger than XS, and 4'' smaller than M. On the other hand, their fit instructions say that a close-fitting pullover should have 1-2'' of ease.
So suppose I make a pullover following these guidelines. Then my S will have a 35'' bust, and therefore fit someone with a 33-34'' bust. My M will have a 39'' bust, fitting people with 37-38'' busts.
What on earth does someone with a 35'' bust make?
Knitty's new instructions force their pattern designers to do one of the following two things. Either: every single pattern will need at least a 4'' range in how much ease is acceptable (um, no) or will have to use sizes like "S½", which is silly and confusing.