Konqueror still works, as does IE11. You don't need modern browsers. Most people just want them.
> There are so many exploited zero-days in modern browsers that no modern browser is safe.
Interesting suggestion. Do you know how many of those zero-days are related to modern features? Most of them seem to be coming from "browsers are still made in C(++)" and "Javascript/CSS performance optimisalisations gone wrong" that has been a risk for decades now. There was that time Apple accidentally opened up part of local browser storage from any website to any other website, but the same bug might as well happen with something as basic as cookies; we were just lucky that the bug was in that weird web SQL thing from a decade and a half ago that nobody uses.
People don't want them. People want something that "just works" for them to browse the web. The web is a complex mess of standards that requires a complicated browser right now, but does it need to be?
> There are so many exploited zero-days in modern browsers that no modern browser is safe.
Interesting suggestion. Do you know how many of those zero-days are related to modern features? Most of them seem to be coming from "browsers are still made in C(++)" and "Javascript/CSS performance optimisalisations gone wrong" that has been a risk for decades now. There was that time Apple accidentally opened up part of local browser storage from any website to any other website, but the same bug might as well happen with something as basic as cookies; we were just lucky that the bug was in that weird web SQL thing from a decade and a half ago that nobody uses.