>>92632649this
in Japan, they generally seem more interested in a story as a whole, including it's ending, whereas in the west they feel that ending something would mean it stops making money, so things just go on forever and the numerous victories don't feel as important
consider something like Cowboy Bebop, that series has a definitive ending, and though some people don't like the ending or wish it hadn't ended, it still left the series on a period; and the only time they revisited it afterwards for the movie, it was just another story set before the ending of the series, and it has no impact on the canon ending that the series left on
Trigun did the same thing actually, the movie badlands rumble was just another self contained story
occasionally you get reboots, but those are never advertised as "the new definitive" version, they are just an alternate take on the characters and events, like GITS Arise or the Evangelion Rebuild movies
don't know how the DBZ movies fit though, considering they are an alternate universe (and they may or may not be the SAME universe between all films?)
I'm just rambling at this point