I don't have any data to back this up (or that I'm willing to look up at the moment), but from what I gather most campaigns last less than a year and break up by 10th level.
I believe back in the 3e days, WotC's research suggested that they should design such that a campaign might reach into the upper tier after 18 months of play, if that's a help.
So why do publishers still design systems and publish campaigns with a default assumption of level 1-20? Why make the default something that only a fraction of groups will experience?
Well, only D&D derivatives use levels 1-20. They probably continue to do so for reasons of tradition and to serve the minority who do go that high. I mean, just because most campaigns don't go that high, does that mean they should make that level just disappear entirely?
What published 5e campaigns assume 1-20? None of the WotC major adventure books do that, do they? Ther Paizo adventure paths I thought largely went up to 16 or 17th level.
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