There's still things like driving tests that need to be done in person how do they do those? Most things can be done online but they keep the locations open for things like RealID and driving/vision tests.
That's basically the same for me in North Carolina, only a few things /require/ you to go in to the DMV. We do have the complication of having many states and having to support people getting a new license in the state they move to so there's a constant need for people getting new IDs which needs in person to gather the info and documents about the person.