Ah, this is due to my inexperience. Really the only one I could recall clearly was Changi, and even their PR shots (because I Googled to check I hadn't misremembered) have people with trolleys using them. The
escalators in T2 at Sydney have bollards, which is a shame because in some ways it would be amusing watching people trying to get a luggage trolley onto an escalator ...
Didn't one of Sydney's domestic terminals get travelators which you could use with trolleys? I'm thinking it was the QF one, but I can only find reliable photos of that faux-aircraft-fuselage one near the entry to the airside portion where the shops are. I could've sworn one of the domestic terminals had an extra wing added
decades ago and got travelators to get passengers out to the furthest gates (maybe that happened & they've since been removed). I have vague recollections of thinking how cool the travelators were as a kid.