Maximum beam spans based on joist cantilever length

Here's a clip from my On-Demand Course "Down the Load Path" available anytime at www.BuildingCodeCollege.com.  The new 2015 and 2018 IRC beam span tables confused a lot of folks with much shorter maximum spans than we were all used to.  This video explains why it appears that way, but isn't, and how the 2021 IRC was modified to fix the issue.