One thing that really caused a lot of problems for the LSU offense last year is the complete ineffectiveness of the run game. Yes, running the ball is inherently less efficient than passing and is hard to do very effectively, but it’s still decently important if you want an effective RPO game (what happens if you get a give read after all?), and want to be able to punish teams for emptier boxes.
One thing defenses have gotten really really good at is slowing down the run while staying flexible and pass-conscious in their personnel allotments. In the past, if teams went to 2-high, that presented an open invitation for offenses to run the football, where they’d lean heavily on inside zone.