Barry Salter wrote:

Apart from via the platforms, the two Booking Halls (and, indeed, the
stations) are not linked. In fact, with the closure of the Jubilee Line
platforms, there's probably a good case for closing off the subway
linking the two and going back to calling the Bakerloo Line platforms
Trafalgar Square.

I can see the logic in going back to calling the Bakerloo Line platforms
Trafalgar Square, but not in closing off the subway linking the two.
Apart from the safety benefits of having a link, it's a lot more
convenient for the passengers going to Charing Cross to catch a train.