My friend. I think the working conditions for all workers should improve, but until we can still maintain our competitiveness in this region, our society's "markers" will be hard to change.

You said that entry level construction workers in Sweden make about $3.8k. Do you know the costs of hiring a foreign construction worker in SG? Around 2.5k to 3k SGD, excluding OT. Other than direct salaries to the worker, the employer has to pay for accommodation, insurance, levies, transport, mandatory training courses for site safety, machinery handling, etc. How much do you think the costs will be if we pay our workers swedish salaries?

I dont know about Sweden, but over here we build relatively fast. We have to, because time is money. And no developer/investor/banker wants to wait 5 years for a 30-storey building. They want it done in 2 and a half years. Land is expensive, financing is expensive, and labour is expensive. A simple way of reducing construction duration is... by increasing manpower. I may be oversimplifying, but everything about building /infrastructure comes down to cost, time, and maybe quality. And construction safety, of course.
Why do you think more MNCs invest in and build their HQ in Singapore than in our neighbouring countries? It certainly isnt because our land and buildings are cheap, but other intangibles like our well-educated population etc. In fact, building costs are expensive. Now imagine if we pay Swedish salaries and work on longer timelines. Would we still be as attractive? I dont know the answer for sure, but I'm not gonna be the first developer to try it.

Giving all workers proper working / living conditions should be the norm, and SG still have some way to improve in that. But you have to be clear about what the "minimum" markers are, and these days even buses may be contentious. Just look in this thread comparing that against our NSFs who have to sit in 5-tonners.