Alright, few things;
1. I don't care if you're the richest country in the world, you still have to think about your resources, everything you get for your army is going to come at the expense of other things. Maybe you'll have to spend less on education or you're going to be able to efford fewer F35s.
2. Unless you're getting something like the Israeli namer, a 50 ton MBT chassis to carry around your troops, it won't make a huge difference in terms of survivability. Even then if you want real protection you need some APS. It's the technology that's going to save you more often than just heavy steel.
3. There are good logistical reasons to stick with the lighter APCs.Even if you're the USA, it makes a difference if you can stick 3 APCs into a C17 vs just 1 APC. not to mention the fuel a heavier APC drinks
Look I don't know what the right choice is for Australia. There are too many variables.
I just disagree with the notion that this is a laughing matter.
If you put these two next to each other, even a kid would say that the one on the right is better. But despite having the one on the right being readily available, TAF went with the first one
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So it's not as obvious a choice as it seems