TA ONLY prevents the generation of coordinated RAs. So any other aircraft with TCAS treats your aircraft as if it doesn't have TCAS and thus does not expect you to do any avoiding action and consequently computes its own RAs in accordance with that. This will not compromise safety in the least but will excempt you from following an RA you might not be able to achieve in the first place.
It is an item on our OEI checklist as well, as far as i know one of those items Boeing is pretty keen on.