Unlikely to have changed because it is the older stewardesses that have seniority. This allows them to chose long haul flights. Long haul flights are preferred as they can qualify quicker for rest days & I think the allowance is better. Those shorter flights are more strenuous for the stewardesses.
I've taken Emirates & the stewardesses are a mixture of young angmos & asians. They were kind of aloof. However I would still recommend them because the planes are new & when I missed a flight they rescheduled me on another flight without any hassles or extra cost

Once they even upgraded me to business because the economy seats were full
It's these little things that impresses me. SIA should learn learn from other airlines like Emirates. Had some bad experiences with SIA. One of the most common complaints is that they are quick to penalise$$ business/economy passengers for exceeding the weight allowance, even if it's only by 2 to 3 kg. :( This was at a time when oil was cheap.
I've flown with Air Canada as an economy passenger with very heavy bags, Must have been 10+ kg over the limit & all they did was stick a sticker to indicate that it was heavy
I would also recommend Eva Air's Premium economy. It's cheaper than SIA's economy but with more leg room, the leg room is very similar to business class. Plus they take very good care of your luggage. I had bought an antenna in the US & they took the extra trouble to ensure it wasn't damaged