Such as a vocal protagonist, a greater weapon variety, more situations and special enemies in which strategy is required, a longer story, worthwhile side content, and even some DLCs to relive the great villains of past Far Cry games. Far Cry 6 is an attempt to rectify those mistakes by adding back some old features which were put on the chopping block in FC5 and ND.
Like it or hate it, Far Cry 5 and New Dawn took away quite a bit of what made the earlier Far Cry games great.