I think the point you are missing here is documentation. There’s no reason to have all the bus-factor — it’s just laziness on the part of organizational structuring and lack of mandate to create quality infrastructure with good documentation, you don’t need to be a Fortune 500 to do this. Spoken as a catfish programmer who spent many years repairing the products of “rockstars” after they fucked off to wherever they went. Also if your stuff is too “complicated” to write down that’s a smell — people have documented far more complex pieces of tech than any software only shop has created look at medicine field or any mechanically engineered system. People love to make excuses about not writing stuff down, turns out you only have yourself to blame once you pull the trigger on your foot gun.