What, specifically, more than oil changes is required in your opinion in order to get good longevity out of one?
What else? Just off the top of my head:
Cooling system. Coolant levels must be very carefully observed, and coolant quality cannot deteriorate. Even a slightly low coolant level can result in a cylinder or head failure under higher boost levels, particularly with any deckless block design.
Fuel system. Injectors must be kept near maximum efficiency, or misfires will result. Partial injector clogs or any other fuel system deficiency resulting in a lean fuel mixture can result in quickly overheating the combustion chambers, and causing damage. This demands more regular fuel filter replacements and complete fuel system cleaning.
Ignition. Spark plugs must be more regularly inspected and changed than in a NA engine, or misfires and detonation will quickly result. Turbos are more sensitive to spark plug selection, and some behave badly with plugs that an NA version would be fine with. Coils must be more regularly tested for minimum HV levels or spark blowouts can more frequently occur. In older designs, this extends to more regular replacement of cap/rotor/wires.
Vacuum line maintenance. Vacuum line integrity is much more critical on a turbo engine, as leaks anywhere in the system can result in boost and wastegate irregularities that can reduce performance or cause damage. Higher underhood temperatures are much harder on vacuum lines/fittings - and all other components - in a turbocharged engine compartment.
Sensor and control valve maintenance. TCVs and wastegates must be periodically checked and adjusted or replaced if out of spec. A malfunctioning TCV or wastegate can result in no boost, or excessive boost, or boost spikes, and engine damage. A sensor failure mode in a turbo is more pronounced than with an NA engine. When a sensor failure occurs in most modern turbo engines, the ECM will often - but not always - drop into limp home mode. When it does not, there is trouble. Boost irregularities and spikes can also excessively wear or damage transmissions and other driveline elements over time.
Intake tract. Intercoolers must be regularly inspected for road impact damage and pressure leaks, as do all pressurized intake lines and connections. Many turbocharged engines will oil soak intake hoses, requiring more regular cleaning and replacement. None of this equipment is present on a NA engine.
Turbocharger maintenance. Turbocharger oil and coolant lines and fittings must be regularly inspected for leaks, which do occur due to the very high ambients in that area.
Heat shield and hood liner maintenance. Some turbos (depending on placement) can overheat the hood or firewall (affecting coatings and shielded components) if heat shields and hood liners are allowed to fail or degrade.
This is in addition to the common need for higher than average quality fuels and oils.
There's more to keep an eye on, but I'm pressed for time today.