It's not a 10% range. It's a 25% range up or down.
5e runs well in the "Local lower level heroes barely supernatural" range of level 3-9 that streamed D&D games play and is popular with new groups.
5e doesn't work at low level rookie play, fails are Tier 3 paragon play,and flops hard at epic play. But that's not what popular with newbies and streamers.
5e came outat the best time for a RPG. And it just happens to be good at play for newbs and streams that the zeitgiest pushes. However if the fanbase was pushing Drizzt/MCU/DCAU/StarWars/HOTU play, 5e would be a disaster.