Often advertised as termite proof, this sadly is not 100% correct as many timber components are still used in the house. A common termite entry point is from under the house slab, entering next to moisture areas, such as around pipes and drains. The kitchen cupboards and bathroom vanity units, located next to these wet areas are made of timber or timber components, as is the cellulose (paper) faced gyprock wall sheeting and cornices that the termites will attack.
Timber is a natural insulator from heat, however steel transfers the heat from the roof sheeting, to the hot ceiling space, then down through the walls due to the steel trusses and steel wall framing.
Electrical interference due to the steel wall framing is another possible factor, that may effect your WiFi and cell phone signals. You probably have experienced this in shopping centres.
Water leaking from pipework, leaking gutters or just salty air from your location near the ocean can rust and corrode the steel framework.
Timber framework can be modified on site to rectify issues that arise during construction, steel framework should not be modified as the framework is engineered with connection points that are critical for the overall strength of the house.
Timber framework burns, but steel frames houses can collapse, as the structural rigidity of steel is lost when steel is heated during a fire. Most house fires are not caused by the timber wall frames catching fire, but by electrical faults with appliances, curtains with candles, synthetic carpets and materials too close to heaters etc.
From a house inspectors point of view, I cannot inspect inside the ceiling of a steel framed house as it is not structurally stable to walk on the trusses or ceiling joists. I can inspect a timber framed roof.
The advertising from steel frame house organisations, sounds too good to be true, so look into all the pros and cons yourself, with your next home investment.