I've ran several 5th ed adventures and played in a couple. I am currently running the Dragonlance adventure.
The early bits had you level up every 1-5 fairly quickly. Saw some slowdown with 5 and 6 then ramped back up so the party does the last chapter at level 10.
Basically, the group either gained a level every session or every 2 sessions. Modern adventures, one and done. Start a new with fresh characters that take the rapid rollercoaster of 1-10 again. Rinse and Repeat. Why does WotC do it this way?
Would you prefer a whole adventure that just takes you from 3-6? Then another that does 6-8. Etc? There doesn't really seem to be a reason to make these adventures (like the DL one) to have you gain power so quickly aside from "Now you get cool powers bro and can fight the Mega Dragon at the end!"
Sure you dont get all the sweet later level powers but you still have a ton of fun in just those 3-6 levels.
It's made me realize why the keeping putting out stuff where "Everyone and everything is magical!" because you just need to go adventure for a week and you'll be level 10 with magic coming out of every orifice. Much like EverQuest, yes every banker and leathersmith etc are level 99 warriors or mages. They just took a 3 week vacation and hit the troll dens and came back with power.