I think, given the (presumed) widespread perception that the Greens are arrogant, they ought to publicly air that reflection. If I'm speaking purely strategically, that would be more likely to win votes from me than what they ended up doing. I think the reason they don't is because they're incapable of such reflection. The only policy changes I recall them making are to support increased defense spending following Trump's win, and to oppose IRV and support PR after Bandt lost his seat (I BTW, support going the opposite direction with Condorcet).
As for Chandler-Mather, I think the other MP's complaining is more to do with them not seeing him as an adult than the severity of his treatment. Given how he went on the radio to complain about the treatment, I'd say they were right to.
If we're so concerned about the South China Sea, we can give Taiwan or Japan diesel subs. It's not like the nuclear subs would be of much use to us anyway if they're on the other side of Indonesia.
Although I can't imagine an Internal Combusion Engine sub being at all stealthy, so I'd hope there's some kind of third option.