I'd say only new duplicator counts as a real essential essential.
New dupe.
Fillcan.
Drop down search.
Addon presets.
Separate color set changer so you don’t need rtb/glass.
Probably several other things am forgetting. A few brick packs like BD’s, 1Random, Vertical Prints and Syl’s trees as well.
Justifying anything not being there because they can find it on their own is silly too. How do they know it exists. How do they know what to search for. Even for something like Presets which I knew exactly what I was looking for and knew it existed took me quite some time.