But who gets to decide what "should be" built in? Chrome (the browser) for example came out with pretty much nothing but browsing at first, while its competitors - Firefox and Opera, notably - were only adding features (iirc Opera had things like email, bittorrent and IRC clients built in at the time). This left the choice of what a user would like in his browser to that user himself.
I'm sure that most Wordpress installations have no extra plugins at all - and are none the worse off for it.
But out of curiosity - what plugins do you believe should be part of the default WP package?
Opera has always been a little different (I personally like it), but Firefox was not getting tons of extra features when Chrome launched (why would Mozilla do that when they had such a healthy plugin market).
As far as I see it, Chrome got the bulk of its market share through speed and advertising/bundling (advertised on Google, bundled with Flash, etc...).
I'm sure that most Wordpress installations have no extra plugins at all - and are none the worse off for it.
But out of curiosity - what plugins do you believe should be part of the default WP package?