'tis minor thread drift, but I always thought the job specs of Flight Hostess and Flight Steward called for different roles. Nanny skills and European conversational savoire faire from one group, and sommelier and life-raft lugging from t'other group. When the role distinction went, the Flight Attendant arrived.
Having followed the thread, I now agree with Captain K. Tech crew was a convenient term in it's day. It is now redundant.