No I meant designing a new aircraft with a new type certificate instead of creating the A320neo generation on the same type certificate. The parent comment wondered why Airbus would keep the old computers around, I tried to explain why they keep a lot of things the same and only incrementally add variants. Adding a variant allows them to be flown with the same type rating or with only differences training (that's what EASA calls it, not sure about the US term) which is much less costly.