Aikicat:
First off I noticed that the mountains in the first shot looks quite awful and that there's no AA in the first 2 pictures. The environment looks amazing in the 3rd shot, only a few places have noticeable polygon edges.
There's no "they" in manga. Like most mangas Naruto have a single creator (Masashi Kishimoto), he draws 19 pages a week (except for weeks when he doesn't draw at all) and he have a team that cleans and fills in the shadows for him, then it's printed in the Japanese Shoonen Jump. The anime is then based on the manga, which is about 20 minutes (without intro/outro) and airs once a week. You cannot make 19 pages last 20 minutes unless you stretch the content or add in filler episodes. That's why they added the additional stuff at the ending of each episode, makes it less then 20 min to fill.
It's not like there are just more and more powerful battles like in DBZ, Akatsuki and others where powerful from the start while the kids have to improve as they grow older. BTW, the battle against Freeza in DBZ (after all his minions where defeated) lasted something like 30-40 episodes IIRC (was many years since I counted them).
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