It could helpful and fun for the enemies to use bonus actions more, so that new players can learn from them. For example, enemies could frequently push/shove, hide in shadows, dip, jump to disengage or jump over a hazardous surface, and more. This could show players what is possible and give them ideas (beyond just reading a manual or going through a tutorial.)
Maybe enemies do this, and I just haven't encountered it yet. I do enjoy how enemies climb to higher elevations, teaching us to do likewise.
Perhaps only at higher difficulty modes....
