That's extremely common, it's been happening for ages. You can see it in things like Naruto, too. That's because they made it at a rate of an episode per week,

That's extremely common, it's been happening for ages. You can see it in things like Naruto, too. That's because they made it at a rate of an episode per week, and in parallel with the source material. That doesn't give time for anything very fancy, so it's mostly a panel by panel adaptation. Plus some filler in the mix, because a chapter usually doesn't have enough meat in it to last a whole episode. It's often 2 chapters per episode or so. And that's why the slow pacing and the awful fillers.