i thought the turn off the airway was more importantly to reduce the negative G on the aircraft and passengers. however, one thing I am wondering is how about LSALT? if you turned off your route in an area with high LSALT continuing on that particular heading, you won't have the proper LSALT to protect yourself.
saying TCAS RA, rather then TCAS climb/descent. I believe is to reduce confusion if you initially said TCAS Climb, but then the system revised it and then you have to make a descent instead... rather then saying descent to ATC. The initial TCAS RA just make it clear to the ATC you are following TCAS of whatever it is telling you to do.