Adrian Auer-Hudson, MIMIS wrote:

It puzzles me that LU insists on running Met Line trains thru to
Aldgate. The Junction there must be an operating challenge.
Meanwhile there is ample unused capacity at Moorgate. Surely the
walk saved to City employment centers cannot be so much shorter from
Aldgate?

There are significant numbers of offices both in the immediate vicinity of
Aldgate (and Fenchurch Street) and in the St. Katherine Docks area. As one
who used to commute to the area on a daily basis from Metroland I can assure
you that the withdrawal of Met services would be poorly received. In the
late eighties the off-peak service was cut back to Baker Street but was
restored for Amersham and Uxbridge services in the early 90s.