Owner of XC90 09 since new, RHD, 3.2 6 petrol engine, only has 100,000km. Some things that needed attention over the years:
Top engine mount, the one that connects the driver side of engine at the top back to the body. The rubber went hard, it developed a lot of play and there was a weird noise under light load.
Blower motor squeeked for a long time then seized up. Quite a difficult job.
Probably not typical but my car developed an ABS fault that was a sensor in the brake booster. Needs subframe dropped in a RHD car.
3rd row headrest would not stay up, needs to be opened up and fixed with a cable tie.
Typical stuff like brake pads and rotors.
Recommend tracking down a guy on Facebook who sells Legend 10" Android head units. They are quite good and a great update to the standard system.
Side seat bolster plastic keeps breaking. Bad design.
Seat massager plastic tubes deteriorate and crack and then the air pump runs forever. Cheap fix with AliExpress tubing.
Probably depends on the particular wheel package fitted to the car. With 255 65 R19 car had terrible tyre wear, feather out edge of fronts mainly, until I started to run 45psi.
Fuel filler cap release actuator broke. Replaced the entire plastic housing from AliExpress.