I'm assuming they simply start with a very restrictive list, as it's easier to say "it's supported anyway" later than to explain to people that their PC is inco

I'm assuming they simply start with a very restrictive list, as it's easier to say "it's supported anyway" later than to explain to people that their PC is incompatible despite their tool having told them otherwise before. Other reason might be newer CPU instructions and that they can't guarantee a good experience on older hardware. This is just my speculation, though.