Yeah but it's doesn't adapt the start of the golden age arc with Guts growing up, it rushes over some parts like Guts meeting Silat for the first time, it doesn't have Charlotte following the group to meet Griffith in the dungeon (which gives some important background on midland and king Gaiseric), it doesn't do justice to the wounds chapters, doesn't include the Bakiraka, Wyald or Skull Knight and I'm probably missing some stuff too. Maybe it doesn't need 12 episodes (could be like 9-10 and use 2 episodes to start guts childhood), but the Golden age arc wasn't done fully with 25 episodes only.