I can see we’ll have to agree to disagree 🙂
Oxford Circus to Bond Street is 500m – 5 minutes – along Oxford Street, yet the OSI is a massive 20 minutes. That’s easily enough time to arrive, do some shopping, enter at the other station, and return home. That’s exactly – perhaps aside from the shopping – what Martin Phillp did: his journey was a return to Oxford Street from Forest Hill. That’s clearly at least two journeys yet TfL thinks it should be one. It’s nonsense.
As you can tell, I have an aversion to OSIs in general, and poorly implemented ones like these two make things worse. A journey should start at touch in and end at touch out; the next touch in is a new journey. OSIs, especially when combined with MJTs, serve only to complicate.
This is why I always use Travelcards: all these problems don’t exist.