Rather have a well flown TCAS RA, than an aircraft pitted with hail stones...
I do agree with that statement, however
TCAS is the last line of defence and we should never let it get to that stage.
Secondly an RA can cause further loss of separation against other aircraft in a busy TMA
squawking 7700 would add another line of defence and hopefully prevent it getting to a TCAS RA.