DRH wrote:

Putting the ODTC and in its variants on Oyster would obviate the need
for all/much of the PAYG infrastructure - yellow validators, pink
validators, OSIs, OEPs, Oyster helpline and all. The system has
become ridiculously complex to the point where even those, like
posters here, with a reasonable understanding of it, can be foxed.

If you get rid of all those things how will the system combine a couple of
short single journeys with an interchange outside the gateline into one?
Are you saying why bother, just charge a day travelcard rate anyway?

Paul S