Users opening old files with legacy 3D effects were shown a prompt to convert to the new 3D system (non-destructive, but results sometimes differed).
Progress hurts. In 2021, Adobe officially killed: adobe illustrator 2021 version history
: Users gained the ability to align text vertically to the top, middle, or bottom of a text frame. The Rise of the iPad (v25.0) Users opening old files with legacy 3D effects
A critical update allowed users to browse and restore previous iterations of a file directly from the cloud. If a design went wrong, users could "roll back" to an earlier state. adobe illustrator 2021 version history