Fully flexible fares with status prove to be a very helpful way to an op-up if required. Lets get our priorities right
Seriously though, if a business trip needs extending, re-routing or cancelling these do indeed prove to be worthwhile, especially if your business is particularly unpredictable. CW often seems to sell out before F and our company does not (usually) shell out the extra for a true 'F' ticket - quite a lot more £ than an 'A' fare with BA, although does depend on route. Buying a seat at the airport would not sit well with me as could in fact be considerably more costly in time etc. than the original FF fare.