The same is true for Firefox and Chrome, which stopped support for any macOS version below OS X 10.9 Mavericks long ago. One problem of using an OS X version this old is the browser: The internal Safari wasn't updated in ages, having lots of unpatched security issues. Frequently, people on this sub state that they are still using OS X 10.6 Snow Leopard, OS X 10.7 Lion, or OS X 10.8 Mountain Lion, either because they like these OS versions or because they are stuck with them as their machines didn't get newer macOS versions from Apple.
