So you are figuring you know that the authors HAD to have that be a riceball and they weren't just using it because it was their cultural norm and if it can interchangeably be used with something else and convey the same meaning or implication it still should be kept as something that might confuse a foreign audience because "dangit people should have to research to enjoy cartoons"?
Changing a story to make it more relatable exposes more people to the story in the first place. Once interested people can (and will) go search out the "original" version, something they wouldn't even have engaged in if they experienced something confusing or unfamiliar.
I don't consider the moral weight of changing a cartoon to cater to local audiences on the same level as having porn cater to underage people. no.
People still died in DB. They even explored the fact that Goku killed his own adoptive parent. They showed Goku ripping through and killing people, people having limbs broken and suffering greatly on screen. They had nudity and perversion allusions. While the newer threats did increase the possible damage it was more because of the insane power creep necessary to keep them a relevant threat than it being more "grown up". I would argue that content wise Z is no "worse" than the original.