Although Blade Runner is often called cyberpunk, it isn't really. There's basically no computers whatsoever (unless you want to call Deckard's photo editing tool a computer) and no cyberspace. I think the only connections with cyberpunk is that Blade Runner's setting is gritty and it's implied that Asia has taken over from the US/Europe as the primary culture.
Fredric Jameson considered the key feature of cyberpunk to be transgression, that is to say the erosion of boundaries. Cyberspace is cyberpunk because it erodes the line between physical and digital space, mind and body. Megacorporation's are cyberpunk because they erode the lines between private and public life, national borders, and so on.
Transgression is also the key theme in Blade Runner. What is being transgressed is the distinction between machine and organic body. Synthetic and natural life, person and machine, authentic and inauthentic memory, and so on.
Computers are only one particular artifact of the cyberpunk genre because they're a great example of a tool that breaks down barriers. But Blade Runner has every reason to be situated in the genre as well, because it deals with the exact same topic, merely placing focus on a different technology.
Absolutely, I agree. My comment was written in the context of Shadowrun as an approximation of Bladerunner though. I'd say Shadowrun is strictly further away from Bladerunner than Cyberpunk, given that it's essentially just Cyberpunk + every fantasy trope you can think of.
