To be fair to Blade Runner here, I don’t think it was really made to be “Cyberpunk”. It has some of the themes and inspired a lot of future Cyberpunk work (at the very least aesthetic wise), but the book “Cyberpunk” wasn’t published until a year later and “Neuromancer” didn’t come out until two years later, so a lot of the themes that we consider Cyberpunk weren’t fully realised yet. I guess you could argue it’s more proto-Cyberpunk (and a number of other sci-fi from before then), but it’s pretty firmly entrenched as Cyberpunk now, and to be honest, I don’t really disagree either. Strict definitions for genres are pretty tricky, even more so for foundational work like I’d say Blade Runner was.