Full Metal Alchemist should have definitely continued, instead they pull the brotherhood revamp cramp. They should have been thinking on how to reunite them after what happened on the last episode not on redoing the original with added scenes.
Guy Fawkes said:
Bleach is almost as bad as DBZ when it comes to plot. Why is ichigo, a substitute, stronger then the actual shinigami? They give reasons for this but it still looks like as pull to me IMO
I agree with this and it also goes to my justification of why they shouldn't add a new arc to DBZ. Anime is either amazing action and fight scenes or amazing story. DBZ had a horrible story but nobody watched it for the story, you watch it for the fighting. Which was broken up between long uninteresting dialogue sequences, it's either or. If the story became in depth and lush the fighting would have to take the back seat because the plot has to be explained first. Plus it started getting stupid with the fusions and Super Sayian 4 was just awful looking, they quit at the right time.
Most of those animes you listed stopped at the right time, it would have been forced if they kept it going.