Re: "Quality" is a structural attribute, not a bolt-on
And the OS-y you product is, the less relevant the Agile Part of your product developement strategy.
Absolutely. Also if a piece of software is your business system, you certainly don't want to be mucking about with that. Change has to be done very carefully.
I'm sure that's why you see in airlines, retailers, etc a lot of text mode software that originally ran on 3270 terminals. It's there, it does its job, it never goes wrong. If it does break the business is dead in days at most.
Not a place for agile development.
Agile, if done properly, is just another way of discovering what someone's requirements are. However it is often abused as a way of taking short cuts in development. Shortcuts lead to failure.