Just to clarify; I wasn't suggesting that anyone should have a lack of ambition in any way. It's not a bad thing to want to aspire to be a captain, or to move up the pay scale (in fact they're both extremely good motivators), just that some of the arguments I've heard against joining BA (whether through FPP or DEP), and particularly if you're not 21, have focussed on things like the potential of not making your 4th stripe by the time you're 35. I think it's an amazing opportunity whether you're 20 or 40. You may ultimately get different things out of it at different stages in your life, but it's likely to be just as valuable and fulfilling however you manage your career.
Don't get me wrong, who wouldn't want to be a captain at 35 and have a decade on the top pay point before retirement, but that model won't work for everyone for a whole host of reasons. It won't make their career or contribution any less valuable.