It is hard to find a working niche browser when Mozilla and Google are doing everything to make sure the web depends on their behemoths' complexity. They are pushing for the Web Platform. They are constantly adding new features.

I used to use Links 2 as my primary browser until about a year or two ago. I would have preferred to keep using it (actually I still do, but it's no longer primary), but one day, a few years ago, Google said let's kill IE6. I can't remember the date. But I know web devs had a party and since that day, the amount of Javascript on the web has skyrocketed, and it's gone from an optional "experience enhancer" to a requirement in many cases. So I'm not given much choice.

But this isn't just about me personally; I could buy a new computer today if I wanted to. What people have pointed out elsewhere in the comments is true -- there are people who still have old computers, much older than mine. And people (parents too) who cannot afford much else besides aging second hand machines.