In the demon slayer movie, why do the characters no longer care about collecting demon blood do you know? I found it weird that they didn’t mention it but maybe I’ve missed something?
Because the only blood they care about collecting are from demons closest to Muzan and that probably doesn’t include any of the lower rank anymore since the upper ranks exceed them in power significantly. Also the only lower rank left took them so much effort to defeat and even then Tanjiro was injured badly and could only focus on just breathing to not die after the fight. I think I’d give Tanjiro the benefit of the doubt that collecting blood was the last thing on his mind at the moment considering everything that happened to him in the movie. The one chance he had to get any blood from an upper rank would have felt super out of place considering the circumstances and emotions involved. He went through A LOT.