In message , Chris Tolley
writes

One of us doesn't seem to understand what the word "option" means. I
take it to mean that one can use it when it's to one's advantage to do
so.

I take it to mean that if travel using Oyster is more expensive than the
same travel taken without it, it is not a sensible option.

It sometimes is (even if not here)

Of course it is! If Oyster was NEVER the cheaper option, what would be
the point in providing it?

Had the post I was responding to said "it's not sensible for this to be
the only option", then I wouldn't have any reason to disagree.

Nobody is suggesting that Oyster is the ONLY option - that would be
nonsense given that it is unusable on most of the NR network in London.

Look back at the thread and you'll see I was responding to TDK's
statement:

Get an Oyster card and you can start saving when you do.

That's not the case for the type of journey I most commonly take into
London, for which Oyster would be a singularly bad option.

--
Paul Terry