Always seems to me that the real benefit of Crossrail to the underground network is relief on the sub-surface section east of Paddington where three routes share the same tracks to Aldgate.
It is a bit wider than that, it will indeed easy the loading on the Circle,
H&S▸ , District and Met, it will a bigger impact on the Jubilee and from Padd the Bakerloo, likewise from the East it will relive the Jubilee and Central from the SE it opens up new routes into the City, Westend and Docklands.
The other key benefit for travellers from the west will be the Farringdon interchange with Thameslink giving easy access to services to Cambridge, Peterborough also for those east of Reading easier access South to Gatwick etc
It is easy to look at Crossrail in the very short term of the Covid impact, Crossrail will still be here in a 100 years when Covid will be an event in history as the Spanish flu is to us of a 100 years ago.
The one thing I have learnt in my 45 year railway engineering career is what I am renewing now another engineer designed and installed it over 50, 70 ........... 100 years ago and what I am seeing the designs for and witnessing the build of will be in service long after I am in my pine box.
The politicians are circulating ready to pull the corps of the Crossrail project apart once its complete so they can walk away with trophies to aid their prospects at elections, it is the nature of
UK▸ politics