It's not always straight forward to doing that. Plus, watching your level whizzing by at twice the speed of sound can be fun as well. When you need to see something up close, the sudden fast movement can make it tricky to get that close-up. With acceleration used, it solves both issues.
"You level up the fastest and easiest if you do things at your own level and no higher or lower" - useful tip
My 2D game - release on Jun 13th; My tutorials
