Jumping is uterly unimportant if you're looking at it Gameplay wise. To me personally it just feels cheap and lazy if you just roll on Space instead of doing a Jump. Like the Dev scraped all Verticality just to save the Time of making a tiny Jumping animation. I usually only see this in Console Games or cheap Asian MMOs. Again, its nothing important Gameplaywise or anything, I just really really hate it personally if a first or 3rd person Computer Game doesn't allow Jumping on Space. Its so simple and easy to do, and adds so much.
Its fine if you're on a far away topdown perspective or something, but as soon as you're proper FPS/3rd Person, I personally expect jumping or be majorly dissappointed.
Sorry.