The browser is where attacks land. Why is security still focused on the endpoint?

From the source

Presented by CloudMosa Enterprise work now happens increasingly inside the browser, and that shift has made the browser a primary point of entry for cyberattacks as well. Browser-based attacks have surged over the past two years, according to industry reports, while Gartner projects that more than 85% of enterprise workloads will be accessed through the browser by 2027. And yet most enterprise security architecture is still built to protect the device rather than the browser session where tha