I don't understand that argument. In what scenario does it make sense to go through the taxi checklist, enabling TCAS prematurely, and not going through before takeoff checklist?
To quote https://skybrary.aero/articles/tcas-ii-activation:
This is pretty clear. Enablement of TCAS in the before-taxi checklist is, sorry, plain wrong and against strong real-world recommendations.
STDBY on parking, ALT ON for taxi, TA/RA when entering any runway, back to ALT ON after leaving runway, STDBY on parking.
I'm really interested what scenario made you deviate from that.