If they wanted to do two documents, one much longer with lots of white space, and another much shorter so you could slip it into the back of the book, that would have been great. But choosing just the long method left a lot of people not liking having to carry the bulky document it resulted in. The size of the errata document was a common complaint from 4e players here and at the WOTC boards. It certainly was not a universal complaint, but it was a common one. The people who used the DDI didn't care, but a lot of those lugging around the books were not pleased with that "improvement".
What it comes down to is 'expectation of work'.
You're right, Mistwell, in that if you just took the 4E errata and corrections document as-is... that's a large document with many pages of paper to sift through. And those who deal with that document as-is, understandably would get annoyed with it. And you also make a good point that *if* WotC was to release a second document that was only the precise change made rather than the entirety of a re-written paragraph or power block... it would save time, energy and make things more usable for a good number of players.
I suspect though, that the counter to that which many of the other people seem to be thinking (and granted, it's quite possible that I'm suggesting this idea incorrectly, but its what I've been interpreting from what is being said)... is the idea that it really doesn't need to be up to *WotC* to do this work for the players. At some point, players need to take it upon themselves to put in a bit of work to take what WotC gives them and repurpose it for their own use. In your case... it would seem to be taking the full errata document, extracting the information for the very specific powers/rules that actually affect you and your character, and cut/pasting that into a Word doc yourself to print and put in the back of your book.
WotC did some of the job to cover an overall requirement... now it's up to each player to finish the job to their exacting specifications.
And this refrain of "Whose job is it?" comes up with almost everything. The "math fix feats" were a perfect example-- where the problem of monster ACs being +1 / +2 / +3 points off from a completely balanced math table resulted in some folks stating that WotC needed to fix this problem for everybody by a complete overhaul of the system, some folks thinking that WotC needed to provide a method for individual tables to insert a fix if they felt it was necessary, and finally other folks saying that if individual tables were finding this imbalance of +1 to +3 really affected them that it should be up to them themselves to figure out the best way to course-correct for it.
In the end, WotC did the middle choice... they offered a series of feats that could be used to fix the math if you felt you needed it for your table. And what happened? People went ballistic. Because a full two-thirds of the players didn't get the result they were hoping for-- one-third didn't get an overhaul of the system so that everything was neat and tidy, and another third got a bunch of rules added to the game that they didn't want and need and which were now "available" for their players to take.
Whose job was it? Whose responsibility was it to make this fix? WotC ended up making it their job, and they got shat upon for it. Why? Because as we all know... most players would prefer to take the easier approach when they can get it (so that it saves their time and energy to be spent elsewhere)... and when someone takes it upon themselves to do it but
doesn't go far enough... that annoys people. It's the counter-intuitive situation where a person almost would rather
nothing be done at all than for something to be done only halfway (because inevitably its easier to just ignore the problem when nothing has been done, whereas when something is done halfway to where you want it you feel more of an impetus to follow it through to the end to get it where you actually want it. But that involves you having to do some of the work.)
If WotC just didn't print any errata, many players would be happy because they could just ignore the fact that game probably needed errata, or else just make judgement calls at the time that something broke down. They would never need to think about it. But as soon as WotC created it... it's now something they have to
deal with. It exists. They now have to make the conscious choice to ignore it (and deal with the fallout of other players asking they they are ignoring it), or they have to incorporate it into their game (and deal with the fact that WotC produced it in a format that they themselves have to then hammer away it so its usable to them.)
That kind of Catch-22 is completely acceptable to many players who are more than willing to take what whatever is given to them and put in the additional work to use it, whereas for some players it is the absolute worst thing WotC could do-- put something out there that they have to actually deal with and make a decision on.
And neither group can understand the other's way of thinking.