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Not just LoB, also EDA software, specialized industrial and automotive testing / HiL software and general equipment control software where you can never start from clean slate because there's existing hardware in old production lines with a 10 year support contract.

I.e. basically everything non-web/non-mobile has a higher lifetime.

Someone on HN said recently that business software is like another employee. You wouldn't fire a senior with lots of domain experience, on whom critical processes are dependent, just because it's time to freshen things up.

Even if it lasts for 5 years, that is still a long time to maintain and so the advice in the book is solid. As a business, you may want or need it to last longer.