The old dashboard listed the accounts you had connected and left you to work out what was actually happening between them. That was tolerable with two calendars and confusing with five, because the thing you want to see is not a list of accounts but which calendar is copying into which.
The rebuilt dashboard is organised around those connections. Each one shows where events come from, where they land, and what is being copied, so checking that your work calendar is blocking out your personal one is a matter of looking rather than reconstructing it in your head. Each calendar has its own page for the settings that apply to it, instead of every option living in one long form.
Sync status is visible rather than inferred. You can see when a calendar was last read, whether the last run had a problem, and what that problem was — which turns "I think it stopped working" into something you can confirm in a few seconds.
Read more about everything Keeper.sh does.