Comment by graemep
I would love to see that happen, but its not going to.
It is the people with basic needs who need to stick to the mainstream stuff because they can get support and it does what they expect. People need bank and other complex websites to work. They want to watch online video. Kids will need educational apps.
Also do not make assumptions about elderly people. Not long ago I met a woman (guess in her 70s?) who used to write embedded software for nuclear reactors. I have known many people or similar or greater age who need quite complex stuff.
Its the geeks who can manage with the non-mainstream stuff.
Web browsers have three purposes: document viewer, remote paperwork machine, and cross-platform application framework. I could throw together a browser fully capable of the first two in a month. (Much less time, if you're okay shipping a prototype, which personally I'm not.) Bank websites are not complex, unless you count the business logic: there's no reason they shouldn't work in Dillo.