I keep seeing people post about the TAP and it throws me off. Tie Advanced Prototype. Well, the V1 and the X1 are both prototypes. So, the TAP can really apply to both.
Also, it's a lot easier to type V1 instead of TAP. Also, you can differentiate it from Vader's ship by just saying X1. It's easier to identify and easier to type.
Why type out TAP?