What "Red Ken" neglects to mention is that Oyster isn't actually
compatible with the Integrated Transport Smartcard Organisation (ITSO)
specification, nor can the "APTIS replacement" Ticket Office machines
handle Oyster.

You can hardly blame the mayor for something that was decided before his
job was even created.

And in a similar vein you can hardly blame the people behind Oyster Card
for misplacing their crystal ball in regards to future card standards and ticket
issuing equipment of third parties who do not disclose the information in the
first place.