> There are of course no "scanners for e-tickets" on the tube and there's no world where buying a physical ticket for a tube journey is faster than using contactless at the gate.
The lack of scanners at Underground stations is a pain for cross-London journeys -- you can't get a ticket from say Milton Keynes to Tunbridge Wells on an e-ticket because it includes the cross-london element
That's a very fair criticism. They should at least make an eticket version of that route a few quid cheaper and make it clear the journey doesn't include the tube part.
The lack of scanners at Underground stations is a pain for cross-London journeys -- you can't get a ticket from say Milton Keynes to Tunbridge Wells on an e-ticket because it includes the cross-london element