There is a really, really substantial difference in the "required for basic credibility/usage" qualifications of a web browser versus an operating system. Opera

There is a really, really substantial difference in the "required for basic credibility/usage" qualifications of a web browser versus an operating system. Operating system instances can run for decades, executing arbitrary tasks, without needing to be restarted. Web browsers need to be updated incredibly frequently just to remain functional for parts of the internet. That's not to say either one is "worse" or "better", but comparing the two on an axis like platform support is like comparing tomahawk missiles and tall ships. Totally different requirements and use cases.