Local conditions
What actually fails here
Humidity Kills Blinds Before Sun Does
The sun on this coast arrives sideways. From about three in the afternoon it comes in under the eave rather than over it, which is why a north-west facing living room can be pleasant at noon and unusable by four. An eave is a shading device sized for summer noon, not for a low western sun, and a roller blind is the only thing that answers it without bricking up the view.
The second problem is the one nobody quotes for. Brisbane and the Gold Coast sit under months of high humidity, and humidity is what finishes a cheap roller blind long before the sun fades it. Chain mechanisms seize in an unconditioned bedroom. Fabric without a proper anti-fungal finish spots along the bottom bar in a bathroom, and once it has spotted it does not come back.
Which is why we ask which rooms have air conditioning before we quote fabric, and not after. Anyone who does not ask is quoting a catalogue, not your house.