@thomasfuchs yeah, that strategy doesn't always work that well. https://www.bbc.co.uk/news/business-64036529.amp
I've also worked on legacy systems that no one understands any more and there is no spec other than the live system. I think relying too much on something that people don't want to work in any more is a false economy. The TSB system before the migration was failing as well and they couldn't get anyone to fix it
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