Signing in has always dropped you on the dashboard, but the dashboard is not everyone's first stop. If your day starts with clearing the inbox, or the board is where you actually work, it is a page you click straight through on the way there.
Account settings, General now has a Default page. Pick the dashboard, planner, schedule, inbox, campaigns or activity feed, and that is where signing in or switching workspaces puts you. The dashboard stays the default until you choose.
It pairs with Default workspace from December, which picks the workspace you open in. Set both and a Monday sign-in opens on the client's board you left on Friday.
This only decides where you start. Links, notifications and bookmarks still go where they point, and the dashboard stays one click away in the sidebar.