The ride height is a product of its place of origin. The practical reason why it is at that height and with good wheel clearance, is because it should drive comfortably over dirt and gravel roads, often corrugated at highway speeds and not rip the front of the car off when there is a dip, or repeatedly bottom out the suspension or cause undue stress on the suspension. It should also manage things like cattle crossings, mild washouts and be able to go through a shallow water crossing when required. Yes the SS is tested for that stuff and has to do it routinely, every day for the life of the car, if required by the owner. Thats why Ford, Chrysler and GM built Australian specific cars in the sixties and seventies when Australian roads were often pretty rough outside the cities. The US sourced models of the time literally fell to bits, when driven on the same roads and with the same expectations.
Even though times have changed, the benchmarks set back then are still applied to Australian engineered cars. No model in the range is exempt and thats part of the conditions the car is engineered for. Sure a base model Commodore will do the country stuff better then a Redline SS, but you can bet that both were tested to exactly the same level. When you consider how well the car handles on normal roads, its even more a credit to the engineers involved with its development. When the SS is gone, that will probably be the last time GM will ever engineer a sedan for that type of severity of testing and endurance anywhere in the world. Most people outside of Australia think you need a SUV to go many places a Commodore ute or sedan goes.
Since many Australians are city bound these days and don't know what a dirt road looks like, much less how to drive on one, they often do lower the car for the looks side of things. Often to the point where a speed hump, becomes a major challenge. Basically undoing all the work Holden put into the car. Holden of course, mindful of warranty isn't going to however, incase someone calls them on what an Australian built car should do and there are still rural and commercial customers who do work these cars hard. Of course Australia like the rest of the world is loosing people who have driving skills and an automatic SUV monster is now increasingly been seen as essential to do the kind of thing, several generations of rear wheel drive Holden's happily did without fuss.
One bonus of all this is the stability control and ABS are very, very good on the Commodore when it comes to loose and dirt surfaces. Can't comment on snow as I've never driven in that.
As someone who used to live in rural NSW and had an Aussie engineered Falcon, let me tell you that despite the forums being full of city bound Australians complaining their cars ride height wasn't cool, I was grateful for how the car was setup. My XR8 would comfortably do over the speed limits on dirt and I remember well having to drive it in conditions, that even I would normally say should be the place of proper off roaders. I had to stop a few times to scoop the mud out of the wheel arches and she slid all over the place in the wet and mud, also scratched the bumper on some ruts i had no choice but to drive over, but it got there and in one piece. Not much else outside a Commodore would have done it as easily or in one piece when it comes to a normal family sedan. Its times like that, no matter how rare, when you appreciate what the engineers did for you with these cars.
The end of the SS is also the end of an era of engineering for GM too I suspect.