They should be kept the same. If all classes had the same jump height then that would be one less thing to look forward to a class. Titans use slow but high reaching jetpacks. Hunters have jump abilities that is really fast and can get out of most situations. Warlocks have a glide that is controlled and helps when you don't want to take fall damage. Having all the same height would make these abilities be like if you only had one jump ability for all classes. [spoiler]I know. A long paragraph right?[/spoiler]