To me, that sounds like a Windows problem, not a DELL problem. No matter what components your computer consists of, a basic Windows install should have a suitable driver for your network card, at least to get online to get better and more up-to-date drivers. In my experience, it always does. Maybe I've just been lucky?

As for downloading drivers from a different computer, I think that's mostly done by IT departments to manage numerous computers. Of them, it can be expected they know what they’re doing, and making the process easier could obviate their job, so I suspect they like the way it is now.

you're breaking the 0.01% use case at the expense of the 99.99% use case. maybe the 99.999%

Oh, I know all about that, it can be quite an ordeal. Earlier this summer, I spent a month in rural France for a film shoot. A few days after I arrived, my MacBook Air started acting up, all apps would crash immediately after launch. Ran Apple Hardware Test: bad RAM. I called Apple, they wouldn't send someone out to fix it, I had to bring it to an Apple reseller for repair. Which I did, and it was fixed in three days. However, even in that larger city (Poitiers), their Internet connection was bad. They wouldn't install the OS for me because they knew their Internet connection was unreliable. Afterwards, I tried installing the OS via a WiFi network at a local bar, it took 4 hours and then it failed. I tried a different bar, same story. Eventually, I went to a cyber cafe in an even larger city, where it took 1,5 hours and went through.

OS X’s web downloader should allow for partial downloads, download suspension, and redownloading of specific corrupted blocks. It's great that you don't need a disk or USB drive to install OS X from scratch, but the process still needs work.

As for the Internet connection, I think that’s kind of expected of a computing device nowadays.