Although not relevant anyway to A380 (SQ's A380 traffic relies more on connecting traffic rather than traffic that actually crosses the border), I'm not sure I'd categorise their border policy as worse, or even as harsh as Australia.
1) Anyone can leave without obtaining an exemption.
2) Citizens and permanent residents can return to Singapore without restriction (although face hotel quarantine and are liable for any medical costs if they test positive for COVID within first two weeks of return), although those on work passes face restrictions that go up and down depending on the status of the outbreak (at the moment most can't come back if they are overseas, due to recent restrictions).
3) There is no cap on quarantine for arrivals, Singapore is taking about as many (or even slightly more) in total as Australia (with 1/5th the population, so 5x per capita).
4) They are pragmatic regarding low risk countries (no quarantine for arrival required travelling from Australia, for one),
5) On the downside they have tightened up (last week) on the non-low risk countries, now requiring a ghastly 21 day quarantine.
Put it this way ... if I were a Singaporean Citizen who was a permanent resident of Australia I could not return to Singapore to visit relatives. But as an Australian citizen who is a permanent resident of Singapore I can go to Australia to see my mother, brothers, sisters, nieces and nephews. Singaporean Citizens abroad can book a flight and return to Singapore ... no caps. Australian citizens abroad face the caps and low availability. If Seat0B was a Singaporean or PR living in Singapore, no problems to depart and visit their son in Dubai (provided they can get entry to UAE and willing to do quarantine on return). Not an option for someone living in Australia.
Pick the one party benevolent dictatorship and pick the liberal democracy.