So you'll not only need to know all these sublanguages (epochs) but also how they interact with each other, especially when you need to refactor code that needs

So you'll not only need to know all these sublanguages (epochs) but also how they interact with each other, especially when you need to refactor code that needs to cross these "epoch boundaries" (refactor the functionality not just to "upgrade" to a different epoch). Who comes up with that stuff? :-/