When I've got my haste sigil from my armor active, I can jump from a bottom slab over 2 high cobblestone walls (don't want things getting out of my nether portal) so I think it's got you covered. Also, it's got step assist (so all my 1 block high cobblestone "don't acidentally walk off the edge" blocks are kind of pointless....)Hmm, it's more about the 3 blocks high jump. Without flight, it is imperative. All those 0.5 height tubes and getting stuck in a 1.5 high space >_>.