For instance, I had the opportunity to review an RFP put out by a state government for software to run a single state government. The specifications stated that a SINGLE software should be used for running the full administration of all of the departments of the government - including completely disparate things such as HR, CCTV management, AI enabled monitoring of rodents and other animals near/at warehouses, all healthcare facilities, recruitment, emergency response services etc...
ONE SOFTWARE for ALL of these!
There isn't a single company in the world who can write software to monitor rodents, hospital appointment booking, general payroll, etc. And since the integration required was so deep, it would be impossible to use existing best-of-breed software.. and everything has to be written from scratch.
How is such a software project ever going to suceeed?