It’s not more important, but as important.

It’s two different sets of data; they tell different stories. OP’s data shows that income did not keep pace with housing, although this could be the same with the other cities. I agree that absolute data could have been useful.

Your cited data does imply affordability in Singapore, but I might question it’s methodology. Is it really affordability if household income is being held up by the rapid rise of dual income households in Singapore? Is the trend of dual income households the same for these other countries? They might seem more expensive because dual income % may have not seen similar growth. This is why despite how “affordable” Singapore seem to be, it is a huge struggle to have a family. Nobody in the household can afford to stop working.

What’s going to happen to single person breadwinners for example, if the government uses dual household income as a gauge for affordability (as they are now)? What used to be affordable for single income households now requires dual incomes to sustain.

Therefore, a more robust way would be to calculate single income over price/sqm ratios instead of household income vs house (which can vary in size)