wrote

But that doesn't explain why they're not planning to send some
suburban Charing Cross trains to Waterloo via Lewisham and Peckham
Rye. That would help to free up the Borough Market tracks without
adding to congestion between Bromley and Victoria.

It would be so slow that passengers wouldn't use them. The Dartford -
Blackfriars/Holborn trains never loaded well, and were eventually withdrawn,
while the Dartfod - Bexleyheath - Victoria service, a comparatively recent
innovation, are also lightly loaded.

Peter