It’s true that in a seniority based system, the desirable international routes often have some of the more experienced cabin crew. However, I don’t go to work looking for “trolley dollies”!
Rather, I need my interactions with them to be high level competence, which is more often found in the more seasoned crew.
My primary interactions are meals, cockpit security during crew relief, and as my eyes and ears in the cabin…which is esp important during a medical or mechanical emergency.
That’s not to say that our senior international flights don’t have younger, less senior cabin crew as well. In fact, most of the language-qualified crew members are more junior, but their language skills allow them to bid for one of the language-qualified positions.
All that said, I get your point. There are many airlines across the globe that do not operate on a union-rule seniority system or have to comply with equality laws during hiring or rostering. That might be good for the airlines, but I’d wager it’s not nearly as good for the enjoyment of a career Flight Attendant.