1/2 Why do D&D premade adventures all rush characters up the levels so quickly? So different that older game versions. Is this an attention span issue with this generation? Curious why @Wizards_DnD want everyone to be 20th level so quickly. No, primarly driven by our understanding of how often groups meet and how long their campaigns run before starting a new one.
— Mike Mearls (@mikemearls) March 8, 2018
I don’t know about getting to max level quickly, but the levels below 5th are so weak, that most people want to get so their characters can do the cool stuff. (Ex: fireballs, 2 attacks or whatever your class gets)