I was aware that new packages added later (not in Everything) are placed in updates. That is misleading. If you don't like that, change it.
The fact still remains that there are several thousand updates. Does the average user have that many packages installed where a significant percentage of total updates would apply to them, probably not.
On my system, and I don't have any devel stuff installed, it is fairly common to have a few hundred megabytes worth of updates a month. That's not dialup friendly.
I haven't used a dialup modem since 1998 and I'd be curious how many modems you can buy today would even work with Linux to begin with.
Fedora has a lot of updates. That is a fact. That's something I like about Fedora... and one of the reasons I use it for desktop stuff. I maintain my own local mirror but I don't necessarily recommend other folks do that. I maintain a personal Fedora remix as well as build OpenVZ OS Templates... so I do use it quite a bit.