How is that relevant? Australia is 29x the area of New Zealand and 5x the population; and like New Zealand, it uses paper-based instead of electronic voting. I see no reason why a paper-based process can’t be scaled to work for a country of any size, even one bigger than Brazil.
> We have election results 5h after election ends
A slower but more trustworthy process is superior to a faster but less trustworthy one. Nobody needs results ASAP
> and there is no evidence whatsoever of fraud.
Elections should be held to a higher standard than merely “no positive evidence of fraud”. We should demand everything reasonable has been done to make fraud as hard as possible. I think elections in Australia meet that standard (and probably several other countries too, such as New Zealand and Germany). I think Brazil, and the US, among others, fail it. Their election systems fail to take every reasonable measure to prevent fraud, and hence fraud is inherently more likely - and the absence of any specific evidence does nothing to alter that conclusion. Even in the absence of any specific evidence, claims of fraud are more likely to be true in a system which makes fraud easier