I guess it might be relevant for force users that roleplay their deaths, or their masters' deaths or something...
It appeared that Yoda and Ben chose to move on, where Vader had just had an awakening and was fighting it. I don't know if that has anything to do with it. Not sure if Lucas had it all worked out, or if he just thought it would look cool for guys to vanish. Also, recall that the two who disappeared would reappear as apparitions, and Anakin didn't until they redid Jedi..
"The stars in your eyes are just shattered glass. And those dolls on the shelf become the men in the gutter. Never asked no one for life, but here you are in someone else's world. Sleep, little one sleep. I'll never sleep that way again until I die."
There is nothing "more appropriate to SW," since the "canon" sources covered almost any possibility. Also, we are a community of roleplayers who enjoy the sci-fi environment of Star Wars. SWC is the sum of what we like to do, and there is nothing "more appropriate to SWC" either.
If there is someone or a group whose tradition and usages is to cremate a body, that is fine. Burying corpses is also fine. Both are "more appropriate to SW and SWC" and none is more appropriate than the other.
With the wealth of different sentient races, it is very likely each race has its own traditions and good reasons to act like this instead of that.
If you're writing an IC article, your best shot would be to contact different groups (religious groups are probably a good start, along with racial/cultural groups) and see what they would advocate IC. This board is for OOC information though so we can't help you here directly.