I would argue that a truly open source, easily embedded browser engine that everyone can use is more important than an independent browser. The only problem with Blink is that it's controlled almost entirely by Google. Otherwise, it's an outstanding piece of tech. It would be just about perfect if the project operated more like Linux. We wouldn't need competing engines if development was democratized. The project itself becomes the source of truth as far as standards are concerned. Each browser distro enables what they need and if something becomes popular it's just a matter of other distros enabling a build flag.

Four percent is a rounding error, and I'm seeing a lot of technical people who no longer prioritize testing on Firefox. I doubt many younger devs have even tried it, and its mobile presence is almost zero.